Solve the following sums:
(3a-5b-c)²
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Answer:
Step-by-step explanation:
(a+b+c)²=a²+b²+c²+2ab+2bc+2ac
a=3a,b= -5b,c= -c
(3a-5b-c)²=(3a)²+(-5b)²+(-c)²+2×3a×-5b+2×-5b×-c+2×3a×-c
⇒9a²+25b²+c²-30ab+10bc-6ac
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