solve (2x-y+3z)(4x²+y²+9z²+2xy+3yz-6xz)
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Let a=2x; b=-y; c=3z,
(a+b+c)(a^2+b^2+c^2 -ab -bc -ca)= a^3+b^3+c^3-3abc
= (2x)^3+(-y)^3+(3z)^3- 3(2x)(-y)(3z)
= 8x^3- y^3+ 27z^3+18xyz
SECOND METHOD
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(a+b+c)(a^2+b^2+c^2 -ab -bc -ca)= a^3+b^3+c^3-3abc
= (2x)^3+(-y)^3+(3z)^3- 3(2x)(-y)(3z)
= 8x^3- y^3+ 27z^3+18xyz
SECOND METHOD
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