exam Maths Puzzle Numerical Ability

I have to solve using the quadric formula and if there are no real roots say so...Can you please help me? Thanks...:)

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Number 14

3 = 7x - 4x^2

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exam Other Question

Please help me solve the equations factoring (x^2+2x^3)-(3-6x)

I would greatly appreciate if someone could help!!!!
Thank You!!

Question is from online course there is no textbook to list. How do you know what to do for the next step in a proof?