exam Maths Puzzle Numerical Ability

Write the quadratic equation with a lead coefficient of 1 whose roots are 1+3i and 1-3i.

Could someone show me how to this step-by-step, please?

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exam Other Question

solving inequalities: 1/7 (42x - 21) >9
42x-21 > 63 i.e.,42x > 84 i.e.,x > 2 How many gallons of 50% antifreeze must be mixed with 80 gallons of 20% antifreeze to get a mixture that is 40% antifreeze?