Book Maths Puzzle Co-ordinate geometry

What is the square of (6a - 4b)

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Book Other Question

Peter bought a $25 item at Store A and paid by a $100 bill. Mary the owner didn't have the change for $75 so she went to Store B and gave them that $100 bill in exchange. How do I find a parabola that passes through the points: (2,-3),(-2,9), and (1,3/2)?