Question

(3x-7)в 2 степени=121

Answer 1

(3х-7)^2=121
2 решения 
1) 3х-7=11
3х=11+7
3х=18
х=6

2) 3х-7=-11
3х=-4
х=-4/3
Ответ: х1=6, х2=-4/3

Answer 2

9x^{2} -42x+49=121
9x^{2}-42x- 72=0
3 x^{2} -14x-24=0
D=196+288=484
$x_{1} = frac{14-22}{6} = frac{-8}{6} = -1frac{2}{6} =-1 frac{1}{3}$
$x_{2} = frac{14+22}{6}= 6$