exam Maths Puzzle Numerical Ability

What is 5X + (X+35X)2X+15)

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a line with slope 305and y-intercept (0,4)












9
Given f(x) = -x3 - 3x2 - 2x - 6, find f(-3), f(0), and f(3)
Now do I have to substitue a number for x? I am so confused!! Thanks for your help!