Question

Resolva:
A) (3×-1) • (3+20)
B) (2×-3y) •(5×+y)
C) 2×-1+3+×

Answer 1

           
            A) (3×-1) • (3+20) =
                 9x + 60x - 3 - 20 =
                         69x - 23

            B) (2×-3y) •(5×+y) =
                 10x² + 2xy - 15xy - 3y² =
                 10x² - 3y² - 13xy

            C) 2×-1+3+× =
                 3x + 2