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PSYCHO15rus [73]

4 years ago

14

What is the answer for x2-3x=10??

1 answer:

tensa zangetsu [6.8K]4 years ago

6 0

1) set equation equal to zero: x2-3x-10=0
2) factor equation: (x-5)(x+2)=0
3) set each half-equation equal to zero: x-5=0 / x+2=0
4) solve for x: x= -5 and 2

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Number two please <br> ASAP

miv72 [106K]

The solutions for $-5 +2x^{2} = -6x$ is option 3. $x= \frac{-6 \pm \sqrt{36-4 (2)(-5)}}{4} .$

Step-by-step explanation:

Step 1:

First, we must bring the equation to the form of $ax^{2} +bx +c =0.$

So $-5 +2x^{2} = -6x$ becomes $2x^{2} +6x-5=0.$

The value of a is the coefficient of the $x^{2}$ term, the value of b is the coefficient of x term and c is the coefficient of the constant term.

Comparing the above equation to $ax^{2} +bx +c =0,$ we get $a = 2, b = 6,$ and $c=-5.$

We have the formula $x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}.$

Step 2:

By substituting the known values, we get

$x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a} =\frac{-6 \pm \sqrt{6^{2}-4 (2)(-5)}}{2 (2)}.$

$\frac{-6 \pm \sqrt{6^{2}-4 (2)(-5)}}{2 (2)} = \frac{-6 \pm \sqrt{36-4 (2)(-5)}}{4} .$

This is the third option.

8 0

4 years ago

If the walls are 9' high, how much paint would I need to buy to paint the walls of all three bedrooms?

ludmilkaskok [199]

Answer:

The required paint for a total of $1.404\ ft^{2}$ is approximate 6 gallons

Step-by-step explanation:

we know that

To find how much paint would I need to buy to paint the walls of all three bedrooms, calculate the area of all three bedrooms

<em>Master Bedroom</em>

The area is equal to

$A1=(16+16+12+2+18)*9=576\ ft^{2}$

<em>2 Bedroom</em>

The area is equal to

$A2=(12+14+10+10)*9=414\ ft^{2}$

<em>3 Bedroom</em>

The area is equal to

$A3=(10+10+14+10+2)*9=414\ ft^{2}$

The total area is equal to

A=A1+A2+A3

$A=576+414+414=1.404\ ft^{2}$

Approximate one gallon of paint covers 250 square feet

so

$1.404/250=5.6\ gal$

7 0

4 years ago

Move the correct words to the angle.

ElenaW [278]

Answer:

top box: ray

bottom box: endpoint

Step-by-step explanation:

top box: a ray is a line that doesn't stop and that is represented by a arrow on the end of it

bottom box: an end point is where a ray, or line segment stop and since i see two rays that stop there it is an endpoint

7 0

3 years ago

Ms.Acton spent $205.60 at target. If the sales tax is 6% what was her final bill

Alex

Answer:

217.936

Step-by-step explanation:

Take 205.60 times 1.06%

then you will get your final answer

You could also take 205.60 times 0.06 and get 12.336

then add that to 205.60 and get 217.936

there are 2 ways to do it but the first one I did is way quicker. Thanks have a great day!

8 0

4 years ago

How do you factor trinomials step by step

bagirrra123 [75]

Answer:

Step 1: Identify the values for b and c. In this example, b=6 and c=8.

Step 2: Find two numbers that ADD to b and MULTIPLY to c. This step can take a little bit of trial-and-error. ...

Step 3: Use the numbers you picked to write out the factors and check

Step-by-step explanation:

thank me later

4 0

3 years ago