Question

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2. Solve 4r2 – 9 = 91.


{± 3}
{± 4}
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{±6}

Answer 1

This would be clearer if written as \[Solve~4r^2 – 9 = 91\]Try adding 9 to both sides of this equation. What next?

Answer 2

1) add 9
2) divide by 4
3) take the square root (don't forget the \(\pm\))

Answer 3

Remember You Are Trying To Isolate r (Get r By Itself)

Answer 4

is it {± 5} @mathman @satellite73 @KikiTheBaseCat

Answer 5

\[4r^2-9=91\]
So Add 9 By Both Sides

Answer 6

@KikiTheBaseCat