Question

(3x+1)(3x-2)-(3x-1)²=11

Answer 1

$(3 times + 1)(3 times - 2) - (3 times - 1) {?}^{2} = 11 \ \ 9 times - 6 times + 3 times - 1 - 3 times - 1 = 11 \ 3 times = 11 \ times = 11 div 3$