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Efectuati produsele:

a) (x-1)(x-2)
b) (x-3)(x+6)
c) (x+4)(x+5)
d) (2x+7)(1-2x)
e) (1-2x)(3x+5)
f) (2x+3)(5x-4)
g) (2a+3b)(3a-b)
h) (4x+3y)(4x-3y)
what is efectuati produsele?


1.a)a. (x-1)(x-2)=x^2-2x-x+2=x^2-3x+2 b. (x-3)(x+6)=x²+6x-3x-18=x²+3x+18 c. (x+4)(x+5)=x²+5x+4x+20=x²+9x+20 d. (2x+7)(x-2)=2x^2-4x+7x-14=2x²+3x+14 e. (1-2x)(3x+5)=3x+5-6x²-10x=6x²-7x+5 f. (2x+3)(5x-4)=10x²-8x+15x-12=10x²+7x-12 g. (2x+3b)(3a-b)=6ax-2bx+9ab-3b² h. (4x+3y)(4x-3y)=16x²-9y²
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