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Popular >

factor a^4-4a^2-21

Solution

factor

a^{4} - 4 a^{2} - 21

Solution

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

Solution steps

a^{4} - 4 a^{2} - 21

Let

u = a^{2}

= u^{2} - 4 u - 21

Factor

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

= (u + 3) (u - 7)

Substitute back

u = a^{2}

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

Popular Examples

(- 5 x + 4) (x - 3) = 0

x - 5 > 12

factor (x-8)^{7/2}-64(x-8)^{3/2}factor

(x - 8)^{\frac{7}{2}} - 64 (x - 8)^{\frac{3}{2}}

2 x + \frac{9}{x} \geq x - 6

simplify 64000^{1/3}simplify

6400 0^{\frac{1}{3}}

Frequently Asked Questions (FAQ)

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