Question

Решите уравнения: 3x(x+1)-2x(5x+3)=7x(2-x)+4 8(x^2-1)-3x(x+2)=5x^2-6x-5

Answer 1

$3x(x+1)-2x(5x+3)=7x(2-x)+4\\ 3x^2+3x-10x^2-6x=14x-7x^2+4\\ 3x^2+3x-10x^2-6x-14x+7x^2-4=0\\ -17x-4=0\\ -17x=4\\ x=-\frac4{17}\\ \\ \\ 8(x^2-1)-3x(x+2)=5x^2-6x-5\\ 8x^2-8-3x^2-6x-5x^2+6x+5=0\\ 0x-3=0\\ 0x=3\\ x - kornej \ \ nety$