3 years ago

What is the value of 4r^2-8 when r=3?

Mathematics

2 answers:

Vlad [161]3 years ago

5 0

Answer:

Step-by-step explanation:

So this means to replace the r you see in 4r^2-8 with 3.

Let's do that:

4(3)^2-8

Now to simplify this just use pemdas or a calculator:

4(9)-8 since 3^2 means 3*3=9

36-8

Olin [163]3 years ago

5 0

Answer:

28.

Step-by-step explanation:

Put r =- 3 and work it out:

That would be 4(3)^2 - 8

= 4 * 9 - 8

= 36 - 8

= 28.

You might be interested in

3. You are riding a bike down the street. The radius of the bike wheel is 10 inches. What

kondor19780726 [428]

The answer is 62.83. The formula is C=2 pi r

4 0

2 years ago

Read 2 more answers

De un pliego rectangular de foami que mide 96 cm de largo por 72 cm de ancho,se requiere cortar cuadros de la mayor superficie p

kykrilka [37]

I do not understand ur language I speak English very well sorry I can't help you with your homework

7 0

2 years ago

Does the following table show a proportional relationship between the variables x and y? x 5/6 25/6 125/6 y 2 10 50

ki77a [65]

Answer: A:Yes

Step-by-step explanation:

This table shows a proportional relationship between the variables x and y.

3 0

2 years ago

I need help it's due tomorrow

hoa [83]

5 and 4

3 and 6

hope this helps!

4 0

3 years ago

Read 2 more answers

( 7x + 1/2) + ( 7x - 7 and 1/2) Simplify

pishuonlain [190]

Answer:

The answer will be 7(2x - 1)

Step-by-step explanation:

1) Convert 7 and 1/2 to improper fraction. Use this rule: a b/c = ac + b/c

$7x + \frac{1}{2} + 7x - \frac{7 \times 2 + 1}{2}$

2) Simplify 7 × 2 to 14 .

$7x + \frac{1}{2} + 7x - \frac{14 + 1}{2}$

3) Simplify 14 + 1 to 15.

$7x + \frac{1}{2} + 7x - \frac{15}{2}$

4) Collect like terms.

$(7x + 7x) + ( \frac{1}{2} - \frac{15}{2} )$

5) simplify.

$14x - 7$

6) Factor out the common term 7.

$7(2x - 1)$

Therefor, the answer is 7( 2x - 1 ).

7 0

2 years ago