exam Maths Puzzle Numerical Ability

find the x-intercepts

y=x^2+5x+2

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exam Other Question

3y-(4-2y)=3(y+2)

Can u please help me with this its not in a text book its a worksheet Subtract. Simplify, if possible.
(2x+5)/(x^2+8x+15)-(x+2)/(x^2+8x+15)