Question

a)2.x+3.a,para x = 5 e a = -4 b)x²-7.x+y,para x =5 e y = -1

Answer 1

Basta alterar os valores.
A) X = 5 e A = -4
2.5+3.(-4)
10-12 = -2

B) X = 5 e Y = -1
5²-7.5+(-1)
25-35-1 = -11