Question

if a²-b²=9 and ab=3 find the value of a+b

Answer 1

$\bold{Correct\:Question}$

☑️ If a²+b²=9, ab = 3, find the value of (a+b).

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$\bigstar\underline\mathfrak\red{Solution}$

We know that,

(a+b)²=a²+b²+2ab

Put the given values in it!

(a+b)²=9+2(4)

(a+b)³=9×8

(a+b)²=72

(a+b)=±√72 ( required answer )

Answer 2

Answer:-

(a+b)²=a²+b²+2ab

Adding values:-

(a+b)²=9+2(4)

(a+b)³=9×8

(a+b)²=72

(a+b)=±√72