What is factor x^2-4x-21 ?

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

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factor x^2-4x-21

factor

x^{2} - 4 x - 21

(x + 3) (x - 7)

Solution steps

x^{2} - 4 x - 21

Break the expression into groups

= (x^{2} + 3 x) + (- 7 x - 21)

Factor out

x

from

x^{2} + 3 x : x (x + 3)

Factor out

- 7

from

- 7 x - 21 : - 7 (x + 3)

= x (x + 3) - 7 (x + 3)

Factor out common term

x + 3

= (x + 3) (x - 7)

x^{5} - 5 x^{3} + 4 x

(1 - i)^{3}

- 48.8 = 6.1 a

5 + 3 x \leq 2 or 2 x - 7 > 2

2 (x + 9) - 4 = 25