if a+b=5 and a²+b²=13, find ab
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a+b= 5
We know that,
(x+y)²= x²+y²+2xy
Here,
(a+b)²=(5)²
a²+b²+2ab= 25
We know that a²+b²= 13
13+2ab= 25
2ab= 25-13=12
ab= 12/2=6
Hope it helps! Please mark it as 'Brainliest'!
We know that,
(x+y)²= x²+y²+2xy
Here,
(a+b)²=(5)²
a²+b²+2ab= 25
We know that a²+b²= 13
13+2ab= 25
2ab= 25-13=12
ab= 12/2=6
Hope it helps! Please mark it as 'Brainliest'!
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