Question

решите уравнение (3х+1)^2-(3х-1)^2=11х+1,2​

Answer 1

$(3x + 1)^{2} - (3x - 1)^{2} = 11x + 1.2 \\ 9x^{2} + 6x + 1 - (9x ^{2} - 6x + 1) = 11x + 1.2 \\ 9 {x}^{2} + 6x + 1 - 9x ^{2} + 6x - 1 = 11x + 1.2 \\ 12x - 11x = 1.2 \\ x = 1.2$

Answer 2

(3х+1)²-(3х-1)²=11х+1,2

(9х²+1+6х)-(9х²+1-6х)=11х+1.2

9х²+1+6х-9х²-1+6х=11х+1,2

12х-11х=1,2

х=1.2