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(-2a+5b-3c)²,Expand it, using suitable identities. |
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Answer» SOLUTION : ***************************************** We KNOW the ALGEBRAIC IDENTITY, (x+y+z)² = x²+y²+z²+2xy+2yz+2zx ***************************************** Now , ( -2a + 5b - 3c )² = [ (-2a) + 5b + ( -3c ) ]² = (-2a)²+(5b)²+(-3c)²+2(-2a)(5b) +2(5b)(-3c)+2(-3c)(-2a) = 4a²+25b²+9c²-20ab-30bc+12ca ••••••• |
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