Question

Найдите корень уравнения (х-11)(х+5)-(х-10)(х+10)=9

Answer 1

(х-11)(х+5)-(х-10)(х+10)=9
х²+5х-11х-55-(х²-100)=9
х²+5х-11х-55-х²+100=9
-6х+45=9
-6х=9-45
-6х=-36
х=6
Удачи всем:)

Answer 2

(x-11)(x+5)-(x-10)(x+10)=9;
$x^{2} -11x+5x-55-( x^{2} -10x+10x-100)=9;$
$x^{2} -11x+5x-55-x^{2} +10x-10x+100=9;$
-6x+45=9;
-6x=9-45;
-6x=-36;
x=6.