Question
Factoring by Using a Quadratic Form
Problem: x^4 + 8x^2 - 20
What I have so far:
(x^2)^2 + 8(x^2) - 20
a^2 + 8a - 20
For some reason my textbook says to substitute the (x^2) with (a) as you can see in the las step. The next step after that is factoring [a^2 + 8a - 20].
Problem: x^4 + 8x^2 - 20
What I have so far:
(x^2)^2 + 8(x^2) - 20
a^2 + 8a - 20
For some reason my textbook says to substitute the (x^2) with (a) as you can see in the las step. The next step after that is factoring [a^2 + 8a - 20].
Answers
x^4 + 8x^2 - 20
(x^2 - 2)(x^2 + 10)
(x^2 - 2)(x^2 + 10)
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