if a + b equal 9 and a b equal 20 then a square + b square is
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Answered by
21
a + b = 9
On squaring both sides, we get
a^2 +b^2 +2ab = 81
=> a^2 +b^2 +2*20 = 81
=> a^2 +b^2 = 81 - 40
=> a^2 + b^2 = 41
On squaring both sides, we get
a^2 +b^2 +2ab = 81
=> a^2 +b^2 +2*20 = 81
=> a^2 +b^2 = 81 - 40
=> a^2 + b^2 = 41
Answered by
4
a+b=9
an=20
a^2+b^2=?
by using identity a^2+b^2=(a+b)^2-2ab
81-2*20
81-40
41 is the answer
an=20
a^2+b^2=?
by using identity a^2+b^2=(a+b)^2-2ab
81-2*20
81-40
41 is the answer
Amitgodara:
wrong
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