exam Maths Puzzle Numerical Ability

Subtract
4x� +2x� + 4x� from
4x� + x -3x�

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exam Other Question

how do I solve the following formula:

4X Squared + 70X = -150

thank you
Given f(x) = 3 x+8 and g(x) = sqrt(x+3), find f � g(4) and g � f(4), giving exact answers (using sqrt if necessary).