exam Maths Puzzle Numerical Ability

Factor the polynomial 4 a 6 b 7 c 5 - 8 a 7 b 5 c 6 , if possible.

This is the answer I came up with and I am not sure if it is right.

4a 7b 6c 6(b2 - 2ac)

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Solve the open sentence and name and graph the solution set. Please and thank you, to I can have a clear understanding of what I am doing.

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