Question

determinati solutiile ecuatiilor x(x+2)-(2x+3)(3x+4)=18-5x^2

Answer 1

x^2+2x-(6x^2+8x+9x+12)=18-5x^2

x^2+2x-(6x^2+17x+12)=18-5x^2

x^2+2x-6x^2-17x-12=18-5x^2

-5x^2-15x-12=18-5x^2

-15x-12=18

-15x-12-18=0

-15x-30=0

x+2=0

x=-2

Answer 2

Răspuns:

-2

Explicație pas cu pas:

x²+2x-(6x²+9x+8x+12)=18-5x²

x²+2x-6x²-17x-12=18-5x²

-15x=18+12    15x=-30    x=-2