book Maths Puzzle Numerical Ability

Solve and show all work</b>

3x^2 - 2x - 8=0

Thank you in advance!

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book Other Question

I have to find the perimeter of a rectangle it says use P=2w=2L
my dimensions are in inches and they are 2x for W and 2x+6 for L How do I solve this problem? how do you graph x^2-x-7 as a parabola?