Question

Dadas as expressões A = -a² – 2a + 5
e B = b² + 2b + 5:

A) Se a = 2 e b = -2, entao A + B
B) Se a = 2 e b = 2, entao A - B

Answer 1

a) A= -2^2-2.2+5= -3
    A=-8+5=-3
    B=2^2-2.2+5=5
    B=4-4+5=5
   A+B=2

b)A=-2^2-2.2+5=-3
   B=2^2+2.2+5=13
A-B= (-3)-(13)=-16
A-B=-16

Answer 2

A) A= - (2)^² -2.2 + 5
A= -3
B= (-2)^² -2.2 + 5
B= 5
A+B= 2

B) B= 2² + 2.2 + 5
B= 13

A - B = -3 - 13= -16