exam Maths Puzzle Numerical Ability

Over a set of real numbers, how do you find the domain for: F(x)=x^3+3(x+4)^2-1

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exam Other Question

Find the distnace d(A,B) between the points A(-1,0) and B(4,3). Could someone please explain how to work out this problem?
Write the equation of the line with slope -2 and passes through the point (-1,5)
Then write the equation in standard form.
Thanks