Question

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

4x2 = 81

Answer 1

20.25, –20.25
2.25, –2.25
4.5, –4.5
9, –9

Answer 2

I'm guessing your asking to solve for 4x^2=81.
First take the square root of both numbers. So it would be (squ root) 4x^2= (squ root)81. When you simplify it out, it would be 4x=+/-9 (since you took the square root of 4x^2 which would remove the exponent and the square root of 81 is 9).
After that you just divide both sides by 4 to isolate the variable and you end up with +/- 2.25