Question

. If a - b = 3 and a + b = 5, find
(a) ab
(b) a2 + b2​

Answer 1

Answer:

a) ab = 4

b) $a^{2}$ + $b^{2}$ = 17

Step-by-step explanation:

Adding the two Equations, we get

a = 4 and b = 1

Answer 2

Answer:

a - b = 3 (1)

a + b = 5 (2)

Adding (1) and (2)

2a = 8

=》a = 4 (1)

put a = 4 in (1)

4 - b = 3

=》- b = 3 - 4

=》- b = - 1

=》b = 1

Therefore ab = 4×1 = 4

and a2 + b2 = 16 + 1 = 17