exam Maths Puzzle Numerical Ability

Thank you all for helping, here is my question.
Explain how to complet the square for a binomial. Use x^2 + 6x to illustrate your explaination.

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exam Other Question

I have the following problem that I could use some help on. Find the indicated output for this function. If f(x)=2x^3-3x+1 find f(3). Thank you. Solve each of the following by graphing
x+2y=4
x-y=1