Factorize expressions ax + ay – bx – by

We have,

ax + ay – bx – by

a(x + y) –b (x + y)

(a – b) (x + y)

Divide as directed (x^{4} – 81) ÷ (x^{3} + 3x^{2} + 9x + 27)

Divide as directed (3x^{3} – 6x^{2} – 24x) ÷ (x – 4) (x + 2)

Divide as directed 15(y + 3)(y^{2} – 16) ÷ 5(y^{2} – y – 12)

Factorise x^{2} + 2xy – 99y^{2}

Factorise 6x^{2} – 5xy – 6y^{2}