Question

Verificati daca numarul -2 este solutie a ecuatiei: A) 2x - 4 = 0 B) 2x=0 C) -3x - 6 = 0 D) 6x +12 = 0 E) 4(x - 5)+ 7 = -19 +x F) (x + 2) (x-2) = 0

Answer 1

A) 2x-4=0, 2x=4, x=2 (F), b) 2x=0, x=-2 (A), c) -3x-6=0, -3x=6, x=6/3=2 (F),d) 6x+12=0, 6x=-12, x=-12/6, x=2 (F), e) 4(x-5)+7=-19+x, 4x-20+7=-19+x, 3x+6=0, 3x=-6, x=-2 (A), (x+2)(x-2)=0, -x la a doua -2x+2x+4=0, x la a doua=-4, x=-2 (A).