exam Maths Puzzle Numerical Ability

Hi, I tried to solve for 5x^2=3x+2 and thought the answer is x=2/5 and x=-2.
Also, I tried to solve 3x^3 +2x^2=x and came up with x=0, 1/3, -1. I am not
sure of these answers. Can you please help me? Thank you!

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exam Other Question

Can you tell and explain the equation of the line with given slope and y-intercept. Then graph each line using
the slope and y-intercept.

Slope: 5; y-intercept: (0, 2)
find the area of an equilateral triangle with one side measuring 20cm