What is factor 5x^2-21x-20 ?

The solution to factor 5x^2-21x-20 is (5x+4)(x-5)

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factor 5x^2-21x-20

factor

5 x^{2} - 21 x - 20

(5 x + 4) (x - 5)

Solution steps

5 x^{2} - 21 x - 20

Break the expression into groups

= (5 x^{2} + 4 x) + (- 25 x - 20)

Factor out

x

from

5 x^{2} + 4 x : x (5 x + 4)

Factor out

- 5

from

- 25 x - 20 : - 5 (5 x + 4)

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

Factor out common term

5 x + 4

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

5 v^{2} - 30 v + 40

20 x^{2} y - 28 x

\frac{8 a ^{3} - b ^{3}}{2 a - b}

2 x - 3 (x + 3) < 14

- 4 x + 4 = 0