Question

Find the value of the following expressions at a = 1 and b = -2
i) a^2 + b^2 + 3ab
ii) a^3 + a^2^b + ab^2 + b3

Answer 1

Answer:

1+4-12

7

3+2+4-8

1........

Answer 2

Step-by-step explanation:

1). a²+ b² +3ab

= 1² + (-2)² + 3×1×(-2)

= 1+4-6

= -1

2.). a³ + a²b + ab² + b³

= 1³ + 1²(-2) + 1(-2)² + (-2)³

= 1 + (-2) + 4 -8

= 5-10

= -5