Which equation is equivalent tof(x) = 16x4 – 81 = 0?(4x² - 9)(4x² - 9) = 0(4x² + 9)(4x² - 9) = 0(4x - 9)(4x - 9) = 0(4x + 9)(4x - 9) = 0
Rewrite the equation in terms of u. u² - 17u - 16 = 017u² + u + 16 = 0-u² + 17u + 16 = 0u² - 17u + 16 = 0
Factor. (u + 16)(u + 1) = 0(u - 16)(u - 1) = 0(u + 17)(u - 1) = 0
What are the solutions of the original equation?x = 1 or x = –2x = –1 or x = 2x = –5 or x = –2x = 4 or x = –5
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