exam Maths Puzzle Numerical Ability

Can you help me please

Find all three zeros of f(x)=x^3-4X^2+13x+50 given that 3+4i is a zero

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exam Other Question

I have 3 different problems that I am confused about. Please help me. The 1st one is2+3*5square root2-7. #2) (4/2)+4(5-2)square root 2. #3)-8-81/9*2square root 2+7. Can you pleas h Use the quadratic formula:

2x^2-5x=3

Can anyone possibly help me understand this and how to write the answer in the correct terms. Thank you so much !