Question

PLS HELP OMG

The area of a square is given by this polynomial

4x2 - 36x + 81

Which expression reprents the length of one side of the square?

a
2x -9
b
2x + 9
c
4x - 18
d
4x + 18

Answer 1

a) 2x - 9

Explanation:

The length is the square root of the whole equation.

Sq rt over all 4x^2-36x+81

= 2x - 9

Answer 2

This is quick to see with square root of 81 being 9 and the middle sign being a minus. (a) 2x-9 is the answer