What is factor a^2-4b+ab-4a ?

The solution to factor a^2-4b+ab-4a is (a+b)(a-4)

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factor a^2-4b+ab-4a

factor

a^{2} - 4 b + ab - 4 a

(a + b) (a - 4)

Solution steps

a^{2} - 4 b + ab - 4 a

Group by common factors

= a^{2} + ab - 4 a - 4 b

= (a^{2} + ab) + (- 4 a - 4 b)

Factor out

a

from

a^{2} + ab : a (a + b)

Factor out

- 4

from

- 4 a - 4 b : - 4 (a + b)

= a (a + b) - 4 (a + b)

Factor out common term

a + b

= (a + b) (a - 4)

x^{2} - 18 = - x^{2}

i^{- 4}

5 x^{2} = 30 x - 10 x^{2}

a + \frac{3}{4} a = 21

1 + 2 ∣ x - 1 ∣ \leq 9