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Let A=3x^(2)-7xy+6 and B=7xy-5x^(2)+15 ...

Let `A=3x^(2)-7xy+6 and B=7xy-5x^(2)+15`
Find.
(I) `A-B " " (II) 3A-2B`

Text Solution

Verified by Experts

`(I) A-B=(3x^(2)-7xy+6)+(7xy-5x^(2)+15)`
`=3x^(2)-7xy+6-7xy+5x^(2)-15`
`(3x^(2)+5x^(2))+(-7xy-7xy)+(6-15)`
`8x^(2)-14xy-9`
(II) `3A-2B=3(3x^(2)-7xy+6)-2(7xy-5x^(2)+15)`
`=9x^(2)-21xy+18-14xy+10x^(2)-30`
`=19x^(2)-35xy-12`
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