Quadratic in Form Polynomials Answers

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What substitution should be used to rewrite 16(x3 + 1)2 – 22(x3 + 1) – 3 = 0 as a quadratic equation?

u = (x3)

u = (x3 + 1)

u = (x3 + 1)2

u = (x3 + 1)3

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What substitution should be used to rewrite 6(x + 5)2 + 5(x + 5) – 4 = 0 as a quadratic equation?

u = (x + 5)

u = (x – 5)

u = (x + 5)2

u = (x – 5)2

What are the solutions of the equation x4 – 9x2 + 8 = 0? Use u substitution to solve.

x = 1 and x =

x = ±1 and

x = ±i and

x = ±i and

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