expond the following (-a+2b-3c)^2
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(-a+2b-3c)²
By using the identity (a+b+c)²
(-a)²+(2b)²+(-3c)²+2x(-a)x2b+2x(-3c)x(-a)+2x2bx(-3c)
a²+4b²+9c²-4ab+6ac-12bc
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