What is factor r^2-2r-8 ?

The solution to factor r^2-2r-8 is (r+2)(r-4)

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factor r^2-2r-8

factor

r^{2} - 2 r - 8

(r + 2) (r - 4)

Solution steps

r^{2} - 2 r - 8

Break the expression into groups

= (r^{2} + 2 r) + (- 4 r - 8)

Factor out

r

from

r^{2} + 2 r : r (r + 2)

Factor out

- 4

from

- 4 r - 8 : - 4 (r + 2)

= r (r + 2) - 4 (r + 2)

Factor out common term

r + 2

= (r + 2) (r - 4)

- 3 (x + 12) = x^{6} - (1 - x)

x^{2} + 5 x - 84

\frac{2 x ^{2} - 2 x - 4}{x ^{2} - 4} > 0

90 x^{2} - 200 y^{2}

- 3 x^{2} + 5 x + 3 = 0