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Popular >

factor x^4-4x^2-21

Solution

factor

x^{4} - 4 x^{2} - 21

Solution

(x^{2} + 3) (x^{2} - 7)

Solution steps

x^{4} - 4 x^{2} - 21

Let

u = x^{2}

= u^{2} - 4 u - 21

Factor

u^{2} - 4 u - 21 : (u + 3) (u - 7)

= (u + 3) (u - 7)

Substitute back

u = x^{2}

= (x^{2} + 3) (x^{2} - 7)

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Frequently Asked Questions (FAQ)

What is factor x^4-4x^2-21 ?
The solution to factor x^4-4x^2-21 is (x^2+3)(x^2-7)