Evaluate[x/5-y/7][x/5+z/6] using suitable identities
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(x+a)(x+b) = x²+(a+b)x+ab
[x+(-y/7)] [x+z/6] = x² +[-y/7+z/6]x+(-y/7)(z/6)
= x² +[(-6y+7z)/42]-yz/42
[x+(-y/7)] [x+z/6] = x² +[-y/7+z/6]x+(-y/7)(z/6)
= x² +[(-6y+7z)/42]-yz/42
mysticd:
ur welcome
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