exam Maths Puzzle Numerical Ability

If the sqaure of a positive integer is added to three times the integer, the result is 28. Find the integer.

Need help setting up the problem and possible solving. Once it is set up, I am good with solving it. PLEASE help~

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Equations expressed it in standard form. Please help me with the steps, I need some understanding in how it is done. Thanks, and thanks for this website.

Through (8,3) and (-4,3) Please help. Much apppreiated.
Express using a positive exponent
r^-2