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.

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