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)

3 x - 9 x^{2}

2 (4 v - 5) = 70

49 a^{2} - 16

2 x^{2} - 2 = - 130