exam Maths Puzzle Numerical Ability

simplify:

(4x^3+x^2-3) - (-9x^3+5x^2-6)

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exam Other Question

Please help with radical 12x^3/5. /12x^3/5 The entire equation is under the radical sign. when you are graphing equations, if the y is always horizonal and the x is vertical, what does the line x=y look like? can you explain that into words please?