exam Maths Puzzle Numerical Ability

Please help with this problem 3x^2 + x -4 = 0 What is the solution set ?

Thank you

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exam Other Question

Getting stuck/confused on problems 19, 27, & 29, pg. 479, algebra 1 glencoe, book.
I have the answers, but am having a difficult time coming up with what they have.
Can you expla I am having problems understanding parabola grafting. Example, if I am given a problem that says:

graph y=-2x (to the second power)

How do I set up my table of solutions for x and y?