Question

Solve the equation. If necessary, round your answer to the nearest tenth.

4x2 = 81

Answer 1

take the square root of both sides

Answer 2

sq rt 4x^2 = sq rt 81
2x = 9 -- now divide both sides by 2
x = 9/2 which equals 4 1/2 or 4.5
any questions ?

Answer 3

or if you wanted to....you could divide both sides by 4 giving us :
x^2 = 20.25
then take sq rt 20.25
x = 4.5

Answer 4

oooh! thank you c: @texaschic101

Answer 5

glad to help :)