Question

macar 1 exercitiu din astea HELPPP​

Answer 1

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