exam Maths Puzzle Numerical Ability

Please help me solve this equation. If you could also explain why you take each step, so I can understand it better.THANK YOU! P=2x+2w ,solve for x

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exam Other Question

Find a polynomial of degree 4, having zeros 2, i, -2i, and 4.

I know you start out by getting (x-2)(x-i)(x+2i)(x-4), but I dont know where to go from there. Do I take two facto Mr. Graham invested some of his $18,000 in bonds and made a 5% profit and the rest in bonds that made a 12% profit. If the profit on the 12% bonds was $885 more than the profit on the 5% bonds, how much did Mr. Graham invest in the 5% bonds?