exam Maths Puzzle Numerical Ability

Write each expression as a complex number in the form of a + bi

5i - sq rt of -84

Thank you

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exam Other Question

For some reason I just cannot grasp the concept of the domain and range of functions. Can someone please help with this?

Given f(x)=4x^2-2x-6 and g(x)=2x-3, find the domain of (f-g)(x) and the domain of (f/g)(x). Thanks! factor each expression:

8x^3 + 4x^2 - 2X-1