Question

(x-1)(x+1)=2(x-5)^2-x(x-3)

Answer 1

Решение:

$(x-1)(x+1)=2(x-5)^2-x(x-3)\\x^{2} -1 = 2(x^{2} -10x+25)-x^{2} +3x\\x^{2} -1=2x^{2} -20x+50-x^{2} +3x\\x^{2} -1=x^{2} -17x+50\\-1 = -17x+50\\17x=50+1\\17x=51\\x=51/17\\x=3$

Ответ: x = 3.