Question

корень уравнения (х-1)2+(2-х)(х+2)=0

Answer 1

$(x - 1) {}^{2} + (2 - x)(x + 2) = 0 \ x {}^{2} - 2x + 1 + 2x + 4 - x {}^{2} - 2x = 0 \ - 2x + 5 = 0 \ - 2x = - 5 \ x = frac{ 5}{2} = 2 frac{1}{2}$