Question

(a+b). (a_b) para a=_4 e b 1/2

Answer 1

(-4+0,5) (-4-0,5) (-3,5) (-4,5) = 15,75

Answer 2

(a+b).(a-b)
a^2- b^2
(-4)^2 - (1/2)^2
16 - 1/4
16.4-1/4 = 64-1/4
63/4