A +b =7 and ab = 12 then the value of a square -ab + b square
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Hey there !!!!
a+b=7 ------Equation 1
squaring equation 1 on both sides
(a+b)²=7²
a²+2ab+b²=49
But given ab=12
a²+b²+2*12=49
a²+b²=49-12
a²+b²=37
Now,
=a²-ab+b²
=a²+b²-ab
=37-12
=25
So, a²-ab+b²=25
Hope this helped you !!!
a+b=7 ------Equation 1
squaring equation 1 on both sides
(a+b)²=7²
a²+2ab+b²=49
But given ab=12
a²+b²+2*12=49
a²+b²=49-12
a²+b²=37
Now,
=a²-ab+b²
=a²+b²-ab
=37-12
=25
So, a²-ab+b²=25
Hope this helped you !!!
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