Question

Calculati: a) (4x + 3)(2x - 5) - (2x - 3)(3x + 7)
b) (x - 2)(x la puterea 2 - 3x + 4) - (2 - x la puterea 2)(2 - 3x) + (x + 3)(4x - 3)

Answer 1

a) =$8 x^{2} -20x+6x-15-6 x^{2} -14x+9x+21/\ \textless \ =\ \textgreater \ 2 x^{2} -19x+6$

b)=$x^{3}-3 x^{2} +4x-2 x^{2} +6x-8-4+6x+2 x^{2} -3 x^{3}+ 4 x^{2} -3x+12$<=>$-2 x^{3} + x^{2} +25x-21$