exam Maths Puzzle Numerical Ability

I need help with this problem Add, using the vertical method.
5x^2+2x-4,x^2-2x-3 and 2x^2-4x-3

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exam Other Question
find the y-intercept
-x+3y=24 Solve, and express your answer in exact form: 2^(4x) + 2^(2x) - 12 = 0