factorise a.x^2+20x+19 b.x^2+9x-10
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x^2 +19x+x+19
x(x+19)+1(x+19)
(x+1)(x+19)
x^2-10x+x-10
x(x-10)+1(x-10)
(x+1)(x-10)
x(x+19)+1(x+19)
(x+1)(x+19)
x^2-10x+x-10
x(x-10)+1(x-10)
(x+1)(x-10)
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