exam Maths Puzzle Numerical Ability

Find a quadratic function in the form of y = ax2 + bx + c that would have the given roots.

1. x = 2i and x = -2i
2. x =3 + i and x = 3 - i

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exam Other Question

i need help with this question i have no idea how to beging to solve it.

it says : subtract the lower polynomial from the upper one

2x^2y-5xy^2+2 and
HOW DID PEOPLE GET THE FORMULA A=1/2(B1+B2)H FROM A=BH