1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Sergeu [11.5K]
3 years ago
9

Evaluate the expression 3x^2+ y if x = 1 and y = -3.

Mathematics
1 answer:
elena-14-01-66 [18.8K]3 years ago
4 0
3(1)^2-3= 0
Plug in the numbers because x=1 plug In 3(1)^2 and it equals 3 then subtract y which is 3-3= 0
You might be interested in
June bought 3 1/2 gallons of white paint for $17.50 a gallon and 1 3/4 gallons of blue paint for $19.00 a gallon. What was her t
chubhunter [2.5K]
3 1/2 = 3,5
1 3/4 = 1,75 --> 17,5 * 1,75 = 30,625

3,50 + 1,75 = 4,25 --> 19 * 4,25 = 80,75

30,625 + 80,75 = 111,385
7 0
3 years ago
Find the value of x when 6 - 4x = 7X-9x - 4.<br> The value of x is ..
Anna71 [15]

Answer:

Step-by-step explanation:

90% of people marry there 7th grade love. since u have read this, u will be told good news tonight. if u don't pass this on nine comments your worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of your life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love you

3 0
2 years ago
Geometry question help!!!
pychu [463]
<ACB is congruent to <ADE. 
They are the only angles that are marked with the same congruency marking.
7 0
2 years ago
4-2(x+7) = 3(x+5)<br> Solve equation.
bulgar [2K]

Answer: x= −5

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

4−2(x+7)=3(x+5)

4 + (−2)(x)+(−2)(7) = (3)(x)+ (3)(5) (Distribute)

4+−2x + −14= 3x+ 15

(−2x)+(4+−14)=3x+15(Combine Like Terms)

−2x + −10= 3x+15

−2x−10=3x+15

Step 2: Subtract 3x from both sides.

−2x−10−3x=3x+15−3x

−5x−10=15

Step 3: Add 10 to both sides.

−5x−10+10=15+10

−5x=25

Step 4: Divide both sides by -5.

−5x/−5 = 25/−5

x=−5

*Hopefully this helps:) mark me the brainliest:)!!!

3 0
2 years ago
Read 2 more answers
(x + 2)^2 + (y - 3)^2 = 9. There are two lines tangent to this circle having a slope of -1
spayn [35]

Answer:

So the points of tangency are:

(-2 + \frac{3\sqrt{2}}{2},3+\frac{3\sqrt{2}}{2})

and

(-2 - \frac{3\sqrt{2}}{2},3-\frac{3\sqrt{2}}{2})

Step-by-step explanation:

(x+2)^2+(y-3)^2=9

Since the instructions are to find the points of tangency where the slopes are -1, we will need ti find the derivative.

2(x+2)^1(x+2)'+2(y-3)^1(y-3)'=0

I used chain rule on the left and constant rule on the right.

Let's finish differentiating the insides:

2(x+2)(1+0)+2(y-3)(y'-0)=0

Simplify:

2(x+2)(1)+2(y-3)y'=0

2(x+2)+2(y-3)y'=0

Now we want to isolate y'.

Subtract 2(x+2) on both sides:

2(y-3)y'=-2(x+2)

Divide both sides by 2(y-3):

y'=\frac{-2(x+2)}{2(y-3)}

Simplify:

y'=\frac{-(x+2)}{y-3}

We want to find the points such that:

y'=-1

\frac{-(x+2)}{y-3}=-1

Multiply both sides by -(y-3):

(x+2)=y-3

Add 3 on both sides:

(x+2)+3=y

Distribute:

x+2+3=y

Simplify:

x+5=y

So we want to find the points such that the following two equations are satisfied:

(x+2)^2+(y-3)^2=9

y=x+5

Let's replace y with (x+5):

(x+2)^2+((x+5)-3)^2=9

(x+2)^2+(x+5-3)^2=9

(x+2)^2+(x+2)^2=9

Combine like terms:

2(x+2)^2=9

Divide both sides by 2:

(x+2)^2=\frac{9}{2}

Take square root of both sides:

x+2=\pm \sqrt{\frac{9}{2}}

x+2=\pm \frac{\sqrt{9}}{\sqrt{2}}

x+2=\pm \frac{3}{\sqrt{2}}

Rationalize denominator by multiplying top and bottom by \sqrt{2} for right hand side:

x+2=\pm \frac{3\sqrt{2}}{2}

Subtract 2 on both sides:

x=-2 \pm \frac{3\sqrt{2}}{2}

Now let's find the corresponding y- coordinates.

y=x+5

y=(-2 \pm \frac{3\sqrt{2}}{2})+5

y=(-2+5) \pm \frac{3\sqrt{2}}{2}

y=3 \pm \frac{3\sqrt{2}}{2}

So the points of tangency are:

(-2 + \frac{3\sqrt{2}}{2},3+\frac{3\sqrt{2}}{2})

and

(-2 - \frac{3\sqrt{2}}{2},3-\frac{3\sqrt{2}}{2})

---------------------Adding geometric/algebra approach here------

(x+2)^2+(y-3)^2=9 has center (-2,3) and radius 3.

I put a drawing to show sort of what we are looking for.

We can find the point of tangency by finding where the green line is perpendicular to while going through center of circle which is (-2,3).

Perpendicular lines have opposite reciprocal slopes. The opposite reciprocal of -1 is 1/1 =1 (so just 1 is the slope of the line perpendicular to the green line. The purple line that I drew will represent our perpendicular line.

So we are looking for a line with slope 1 and goes through point (-2,3).

Slope-intercept form is y=mx+b.

We know m=1:

y=1x+b

y=x+b

We can find b using (-2,3):

3=-2+b

Add 2 on both sides:

3+2=b

So the line is y=x+5 which is the line we found during our calculus approach.

8 0
2 years ago
Other questions:
  • the property that says you can add and multiply in any order, without changing the answer is called the____ property
    5·1 answer
  • 7. The box plots show the average gas mileage of
    5·2 answers
  • Can talk help me with these three word problems
    5·1 answer
  • a rectangular sandbox has a width of 15 ft and a length of X feet which expression represents the perimeter of the sandbox ​
    5·1 answer
  • Thank you guys for following and please follow more it's my humble request​
    11·1 answer
  • Read below for the information
    8·1 answer
  • 7. Triangle FIP was dilated by a scale factor of centered at the origin to
    6·1 answer
  • Solve for x. Enter the solutions from least to greatest.
    11·1 answer
  • A group of 29 friends get together to play a sport first person must be divided into team each team has to have exactly 4 player
    6·1 answer
  • Find the arc length, x, when
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!