If (a+b)=9 and ab= 20 find the value of (a-b) 2
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Given, (a+b)=9 and ab= 20
we know,
(a-b) 2 = (a+b) 2 -4ab
= 9*9 - 4*20
= 81 - 80
= 1
we know,
(a-b) 2 = (a+b) 2 -4ab
= 9*9 - 4*20
= 81 - 80
= 1
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