exam Maths Puzzle Numerical Ability

im preparing for an algebra II test on linear inequalities and one of the study questions is:

Lois makes banana bread and nut bread to sell at a bazzaar. A loaf of banana bread

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exam Other Question

sqrt(63x^15y^9)/sqrt(7xy^11) y to the second power +21y+ c
How do I solve this equation? It's called completing the square.