Question

2)
Find the value of a3 + b3 when a + b = 3 and ab = 2
a) 27
b) 18
c) 9
d) 21
3)
Find the value of a2 +62 when a + b = 5, ab = 4
a) 17
b) 14
c) 16
d) 19​

Answer 1

Step-by-step explanation:

if if a + b is equals to 3 and ab is equals to 2 the value of a cube plus b cube is 9

Answer 2

Answer:

Step-by-step explanation:

Question no.2

a+b=3,ab=1

a³+b³=(a+b)³-3ab(a+b)

=3³-3×1×3=27-9=18.

So option (b) is the correct answer.

Question no.3

a+b=5,ab=4

Now a²+b²=(a+b)²-2ab

5²-2×4=25-8=17.

So option (a) is the correct answer

Hope it will help you.