Factor by sum and product

Question

a) x^2-7x-30 

b) x^2-12x+27

c)2x^2-20x+32

Answer 1

a) (x-10)(x+3)

 

b) (x-9)(x-3)

 

c) 2(x^2-10x+16)

    2(x-8)(x-2)