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1) (x-2y+3z)²
=x² + (-2y)² + (3z) ² + 2(x(-2y) + (-2y)(3z) + (x) (3z) )
= x² + 4y² + 9z² + 2(-2xy - 6yz + 3xz)
2) (3a-5b-7c) ²
=(3a) ² +(-5b)²+(-7c) ² + 2((3a) (-5b) + (-5b)(-7c) + (-7c)(3a) )
=9a²+25b²+49c²+2 (-15ab + 35bc - 21ac)
3) (1+2x-3y)²
=(1)² + (2x) ² +(-3y)² + 2((1)(2x) + (2x) (-3y) + (-3y)(1))
=1+4x²+9y²+2(2x-6xy-3y)
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