Question

(-2a+5b-3c)power 2 expand with suitable identity

Answer 1

( -2a + 5b - 3c )²

By using (a + b + c )² = a² + b² + c² + 2ab + 2bc + 2ac

=> ( -2a + 5b - 3c )² = (-2a)² + (5b)² + (-3c)² + 2 × (-2a) × 5b + 2 × 5b × (-3c) + 2 × (-2a) × (-3c)

=> 4a² + 25b² + 9c² + -20ab + -30 + 12

=> 4a² + 25b² + 9c² -20ab -30 + 12

Answer 2

Refer to the above attachment :)

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