3 years ago

What are the solutions of the equation x4−10x2+9=0? Use u substitution.

Mathematics

1 answer:

PSYCHO15rus [73]3 years ago

7 0

Answer:

Step-by-step explanation:

X^4 - 10X^2 + 9 =0 This factors. It just looks odd.

(x^2 - 1)(x^2 - 9) = 0

x^2 - 1 = (x + 1)(x - 1) = 0

x = 1 and x = - 1

x^2 - 9 = (x + 3)(x - 3) = 0

x = 3

x = -3

The correct answer is C (third one down).

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