Question

Q.5 If a + b = 11 and ab = 15, then a^2+b^2is equal to:
Ans
1. 90
2. 91
3. 93
4. 92
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Answer 1

Step-by-step explanation:

given,

a+b=11

ab=15

here they asked a²+b²=?

a²+b² can be write as (a+b)² -2ab =a²+b²

=(11)²-2(15)

=121-30

=91 is the answer hope it helps

Answer 2

a+b=11

ab=15

a²+b²=?

(11)²-2(15)

121-30

91

So a²+b²=91