exam Maths Puzzle Numerical Ability

Find a value for k so that 9m(squared)- kn(squared) will have the factors 3m + 7n and 3m - 7n.

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Sylvia somersaults from a 3 metre springboard. Her height in metres above the water t seconds after she leaves the board is given by the formula h=-4.9t^2+8.8t+3.How lon Please help im stuck on liner equations the problem is 4y+3x=-12. I need to do this in the form of y=mx+b. Any help will be greatly appreciated, I have a final tomorrow and I just cant get past this to finish my chapterrequired before the final.