multiply 9 X square + 25 y square + 15xy + 12x - 20y + 16 by 3 x- 5y - 4 using suitable identity
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This is in the form of (x+y+z) (x^2 +y^2 +z^2-xy-yz-zx) and this is equal to x^3+y^3 +z^3-3xyz.
The above expression = 27x^2-125y^3-64-180xyz.
THAT'S IT!
The above expression = 27x^2-125y^3-64-180xyz.
THAT'S IT!
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