Question

*
Required
1. If (a + b) =7 and ab = 8, find *
(0.5 Points)
a2 + b2​

Answer 1

Answer:

33

Step-by-step explanation:

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Answer 2

Given, (a+b)=7, ab=10

Squaring both sides

⇒(a+b)2=72

⇒a2+b2+2ab=49

⇒a2+b2=49−2(10)

⇒a2+b2=29

Now,

(a−b)2=a2+b2−2ab

          =29−2(10)

          =29−20

          =9

∴a−b=9

                  =±3

 

Step-by-step explanation:

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