Question

Solve: 16x2 − 81 = 0

Answer 1

16 x 2 - 81

32-81

= -49

Answer 2

x =±9/4

Explanation:

16x^2 − 81 = 0

Add 81 to each side

16x^2 − 81 +81 = 81

16 x^2 =18

Divide by 16

x^2 =81/16

Take the square root of each side

sqrt(x^2) = sqrt(81/16)

x =±9/4