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
vampirchik [111]
3 years ago
11

Evaluate the expression when x= -7. x²+4x-3​

Mathematics
2 answers:
netineya [11]3 years ago
7 0

49+(-29)-3.Answer:

The answer is -80

Step-by-step explanation:

1. What I did first was plug in -7 into "x", so then your  expression is(-7^{2} )+4*(-7)-3

2. Then you multiply 7 two times and get - 49... So then you have -49+4(-7)-3

3. Then you multiply the 4 and -7 and get -29... So now you have -49+(-29)-3

4. Then you add -49 and -29. but keep the negative and get -77... so now you have -77-3

5. Then you add -77-3 but keep the negetive and get -80.

I hope this helps... have a wonderful day.

I am Lyosha [343]3 years ago
3 0
The answer is 18
-7^2+4(-7)-3
49+(-28)-3
21-3
18
You might be interested in
What is the sin of angle B
kifflom [539]
83 is the sin of angle b
8 0
3 years ago
Please help! A-level maths.
astra-53 [7]

x+y=k\implies y=k-x

Substitute this into the parabolic equation,

k-x=6-(x-3)^2\implies x^2-7x+(k+3)=0

We're told the line x+y=k intersects C twice, which means the quadratic above has two distinct real solutions. Its discriminant must then be positive, so we know

(-7)^2-4(k+3)=49-4(k+3)>0\implies k

We can tell from the quadratic equation that C has its vertex at the point (3, 6). Also, note that

-1\le\sin t\le1\implies3\le3+2\sin t\le5\implies3\le x\le5

and

-1\le\cos2t\le1\implies2\le4+2\cos2t\le6\implies2\le y\le6

so the furthest to the right that C extends is the point (5, 2). The line x+y=k passes through this point for 2+5=k\implies k=7. For any value of k, the line x+y=k passes through C either only once, or not at all.

So 7\le k; in set notation,

\{k\mid 7\le k

4 0
4 years ago
What is the arc length?
Gwar [14]

Answer:

approximately 21, when rounded to nearest tenth.

Step-by-step explanation:

First, let's find the measure of angle BAD. Angles BAD and DAC add up to 180 degrees, so 180-57= 123 degrees. Now, let's find the circumference of the circle. The circumference is diameter * π, which is 19.6(π). Then, the ratio is 123/360, so multiply 19.6(π) by 123/360, and you get 21.0381988...... which simplifies to 21 (rounded to nearest tenth)

4 0
3 years ago
GIFT SHOP A gift shop sells souvenir magnets. The store is selling 3 magnets for $10. At this price, how much will it cost to bu
zaharov [31]
£26.4 because 10÷3 is 3.3 requiring and 3.3×8 is 26.4
3 0
3 years ago
Can someone please help with my math work?!
shepuryov [24]
Oh you’re on ALEKS, right?
Sorry off topic lol
Did you maybe try -4, since thats the sequence it’s going in? :)
8 0
3 years ago
Other questions:
  • Write 2 numbers that fit each description.if there is no such number write none.
    15·2 answers
  • What side is adjacent to angle Y?<br> XZ<br> ZY<br> YX<br> None of the above
    5·1 answer
  • What would the graph of y=3/4x-7/8 look like?
    14·1 answer
  • 100 students who are in 9th or 10th grade were asked if they participated in at least one extracurricular activity (sports, musi
    5·1 answer
  • Find the 7th term of the sequence 6,9,12 with steps pls​
    14·2 answers
  • Ask in the photo. Thanks
    13·1 answer
  • A lab technician is tested for her consistency by making multiple measurements of the cholesterol level in one blood sample. The
    13·1 answer
  • 12−x2y if x=−7 and y=2
    11·2 answers
  • Five decreased by twice a number is same as five less than<br> three times the number.
    11·1 answer
  • 2) If ΔABC and ΔXYZ are similar, which must be true? A) BC YZ = AC YX B) BC YZ = BA XZ C) AC XZ = BC YZ D) AC XZ = BA XZ
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!