4x^2 - 81 = 0 (By square root property)
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Answer:
x = 9/2
Step-by-step explanation:
4x² - 81 = 0
⇒ 4x² = 81
⇒ x² = 81 ÷ 4
⇒ x = √81 ÷ √4
⇒ x = 9 ÷2
= 9/2
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