What is factor x^2-20x-21 ?

The solution to factor x^2-20x-21 is (x+1)(x-21)

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factor x^2-20x-21

factor

x^{2} - 20 x - 21

(x + 1) (x - 21)

Solution steps

x^{2} - 20 x - 21

Break the expression into groups

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

Factor out

x

from

x^{2} + x : x (x + 1)

Factor out

- 21

from

- 21 x - 21 : - 21 (x + 1)

= x (x + 1) - 21 (x + 1)

Factor out common term

x + 1

= (x + 1) (x - 21)

y^{2} + 5 y + 6 = 0

7 < 2 x + 1 \leq x + 7

384

0 = x^{2} - 25