What substitution should be used to rewrite 4x4 - 21x2 + 20 = 0 as a quadratic equation?

u = x2

u = 2x2

u = x4

u = 4x4

Question

Thomas Melendez

1 July, 08:11

+3

Answers (1)

Know the Answer?

Annie Stewart · Answer 1

4x4-21x2+20=0

Use proper text notation.

4x^4-21x^2+20=0

That will appear rendered as

Use any preferred different variable,

u = x2

What substitution should be used to rewrite 4x4 - 21x2 + 20 = 0 as a quadratic equation?u = x2u = 2x2u = x4u = 4x4