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(x+1) (x+8)
(2x+1) (x-3)


Răspuns :

(x+1)(x+8)

x(x+8)+1(x+8)

x²+8x+x+8=x²+9x+8

(2x+1)(x-3)

2x²-6x+x-3=2x²-5x-3

(x+1)(x+8)=x²+8x+x+8=x²+9x+8

(2x+1)(x-3)=2x²-6x+x-3=2x²-5x-3