(-3a + 7b - c )square .it is a brainlest question
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( -3a+7b-c)² =(-3a)² +(7b) ² +(-c) ² +2*(-3a)7b+2*7b(-c) +2*(-3a)(-c)
= 9a² +49b²+c² -42ab -14bc +6ac
= 9a² +49b²+c² -42ab -14bc +6ac
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