Question

5. Which is (are) the root(s) of 64x^2 – 324 = 0?

O x = 2.25
O x = +/-2.25
O x = +/-4
O x = 0

Answer 1

X = 2.25

Explanation:

64 x^2 - 324 = 0

64 x^2 = (8x)^2

(8x)^2 = 324

Square root both sides:

8x = sqrt 324

8x = 18

x = 18/8

x = 2.25