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6. (4m) ³-(7n) ³
=(4m-7n){(4m) ²+(4m)(7n) +(7n) ²}
=(4m-7n)(16m²+28mn+49n²)
7.(2x+3y+5z) ²
=(2x) ²+(3y) ²+(5z) ²+2{(2x)(3y) +(3y)(5z) +(5z)(2x)}
=4x²+9y²+25z²+12xy+30yz+20zx
=(4m-7n){(4m) ²+(4m)(7n) +(7n) ²}
=(4m-7n)(16m²+28mn+49n²)
7.(2x+3y+5z) ²
=(2x) ²+(3y) ²+(5z) ²+2{(2x)(3y) +(3y)(5z) +(5z)(2x)}
=4x²+9y²+25z²+12xy+30yz+20zx
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this is the answer....
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