Răspuns:
Explicație pas cu pas:
11 Folosesc Relatii Viete : x1+x2=-b/a x1x2=c/a si calcul algebric.
a)(x-1)(x-2)=x²-3x+2
b)(x-3)(x+6)=x²+3x-18
c)(x+4)(x+5)=x²+9x+20
d)(2x+7)(x-2)=2x²+3x-14
e)(1-2x)(3x+5)=3x-6x²+5-10x=-6x²-7x+5
f)(2x+3)(5x-4)=10x²-8x+15x-12=10x²+7x-12
g)(2a+3b)(3a-b)=6a²-2ab+9ab-3b²=6a²+7ab-3b²
h)(4x+3y)(4x-3y)=16x²-9y²
