Question

If (a+b) =5 and ab = 2 than a2+b2=___​

Answer 1

Answer:

(a+b)2=a2+b2+2ab

=>a2+b2=(a+b)2−2ab

Given, a+b=5 and ab=6

So, a2+b2=(a+b)2−2ab=52−2×6=25−12=13

Step-by-step explanation:

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Answer 2

Answer:

a²+b²=21

Step-by-step explanation:

(a+b) =5

ab=2

(a+b)²=5²

a²+b²+2ab=25

ab=2

a²+b²+2(2)=25

a²+b²=25-4

a²+b²=21