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Question

Subtract:-
$$2a\left( a-3b+5c \right) $$ from $$5a\ \left( 2a-3c+b \right) $$


Solution

Let $$X=2a(a-3b+5c)$$
$$Y=5a(2a-3c+b)$$

According to the question,
$$Y-X$$
$$\Rightarrow Y-X=5a(2a-3c+b)-2a(a-3b+5c)$$
                $$=10a^2-15ac+5ab-2a^2+6ab-10ac$$
                $$= 8a^2-25ac+11ab$$



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