Question

Решите уравнение а) x^2 + 9x - 22 =0: b) x(x+3) (x+5) (x+8) + 56 =0 ​

Answer 1

$x^{2} +11x-2x-22=0\x(x+11)-2(x+11)=0\(x+11)(x-2)=0\\x+11=0\x-2=0\\x1=-11\x2=2$

$(x+1)(x+7)(x^{2} +8x+8)=0\\x1=-1\x2=-7\x3=-4+2sqrt{2} \x4=-4-2sqrt{2}$