а² - 2а + {5а² - ( 3a – 4a²)}
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а² - 2а + {5а² - ( 3a – 4a²)}
= а² - 2а + (5а² - 3a + 4a²)
= a²-2a+5a²-3a+4a²
= 10a²-5a Ans.
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