2 answers:
Answer:
x =±9/4
Step-by-step 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
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