exam Maths Puzzle Numerical Ability

Line segment CD is the altitude on the hypotenuse of right triangle ABC. AB=25 and AC=20. Find the length of line segment BD, the length of altitude CD, and the degree measure of a

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Factor:
6(a+2b)^2-4(a+2b)^3+12(a+2b)^4

And:
25r^2-90r+81 g=t2-2