If 4x²=81 then what is x?

Answer 1

Greetings! Lets solve this shall we ?

We begin with

4x² = 81

and must solve for x! First we divide 4 to both sides to get

x² = (81/4)...............Then we square root both sides to get

x = ± (9/2)

I hope this helped!

Answer 2

Divide both sides by 4 to isolate the " x² " term.

x² = 81/4

Square root both sides and get

√x² =± √(81/4) = ± √81 / √4 = ±(9/2)

So x is either 9/2 = 4.5 or it is -9/2 = -4.5