exam Maths Puzzle Numerical Ability

Tutor how do I factor 3y^2-14y-24 do I have to find out what y is first? Thank you.

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Please help me with this problem. I am not quite sure how to set it up.
A physician invests $24,000 in two bonds. If one bond yields 6% and the other yields 12 %, how much is invested in each if the annual income from both bonds is $1980? Hi- im just strted school after a long time time and i dint know hoo to do this please help