exam Maths Puzzle Numerical Ability

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

And:
25r^2-90r+81

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exam Other Question

can you please help me?
Find functions f and g so that h(x) = (f ∘ g)(x).

h(x)=(square root symbol)59x^2+78

all numbers are under the square root symbol

Thanks in advance 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