Question

(a + 4)^2 - 5ab - 20b - 6b^2
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Answer 1

(a + 4)^2 - 5ab - 20b - 6b^2

(a+4)² - 6b² -5b(a+4)

Let, (a+4) = x ------(1)

x² - 6b² -5bx

x² - 5bx - 6b²

x² - 6bx +1bx - 6b²

x(x-6b) +b(x-6b)

(x-6b) (x+b)

(a+4-6b) (a+4+b) (from equation 1)