Question

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

Answer 1

x² - 3² + x² - 2•x•3 + 3² - 5x +10 = x²-9+x²-6x+9-5x+10 = -6х-5х+10 = -11х +10 = 10-11х