What is factor x^2-21x+90 ?

The solution to factor x^2-21x+90 is (x-6)(x-15)

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factor x^2-21x+90

factor

x^{2} - 21 x + 90

(x - 6) (x - 15)

Solution steps

x^{2} - 21 x + 90

Break the expression into groups

= (x^{2} - 6 x) + (- 15 x + 90)

Factor out

x

from

x^{2} - 6 x : x (x - 6)

Factor out

- 15

from

- 15 x + 90 : - 15 (x - 6)

= x (x - 6) - 15 (x - 6)

Factor out common term

x - 6

= (x - 6) (x - 15)

\frac{3 ^{8}}{3 ^{6}}

- x^{4} + 17 x^{2} - 16

4 x^{2} - 8 x - 5

\frac{3}{x + 1} - \frac{4}{x} \leq 1

∣ w + 5 ∣ < - 8