exam Maths Puzzle Numerical Ability

If (a) does not equal (b), solve for x in terms of (a) and (b):
x^2+ax=-b(a+x)

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exam Other Question

if i have for example - sqrt 25/12 = sqrt25 is 5 and sqrt 12 would be sqrt 4 times sqrt 3 so sqrt 4 is 2 would my result be 2*5 1/sqrt3 = 10 1/sqrt3? Find the area of a regular dodecagon (or 12-gon) that has sides of 4 feet. Show all work to receive credit.