Question

Решите уравнение (x+10)^2=(x-9)^2

Answer 1

x^2+20x+100=x^2-18x+81
20x+100=-18x+81
20x+18x=81-100
38x=-19
x=1/2

Answer 2

$(x + 10)^{2} = (x - 9)^{2} \\ x^{2} + 20x + 100 = x^{2} -18x + 81 \\ x^{2} + 20x + 100 - x^{2} + 18x -81 = 0 \\ 38x = -19 \\ x = -0.5$