What is factor a^2+4a-21 ?

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

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factor a^2+4a-21

factor

a^{2} + 4 a - 21

(a - 3) (a + 7)

Solution steps

a^{2} + 4 a - 21

Break the expression into groups

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

Factor out

a

from

a^{2} - 3 a : a (a - 3)

Factor out

7

from

7 a - 21 : 7 (a - 3)

= a (a - 3) + 7 (a - 3)

Factor out common term

a - 3

= (a - 3) (a + 7)

2 (4 x + 3) < 14

x^{2} + 6 = - 7 x

12 n p - 3 p + 8 n - 2

1 0^{2} + 10 0^{\frac{1}{2}} + 10 0^{0}

\frac{9 c ^{3}}{c ^{- 4}}