1.

If (64)^2- (36)^2 = 20 k then the value of k is :

Answer»

140
120
80
none of these

Solution :`(64)^2-(36)^2=20K`
`RARR(64+36)(64-36)=20k`
`rarr 100.28=20k`
`rarr 20xx5xx28=20k`
`rarr k=28xx5=140`


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