exam Maths Puzzle Numerical Ability

I am lost on this one

Solve 3x^2-x-4<_0

thank you for your time

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exam Other Question

I don't understand how to solve this problem dealing with absolute value and real numbers.

-|3-9|+2|-5-6|=_____

2|-4-9|-4|2+(9)|=_____

Thank you In triangle ABC, AB is 9 cm. shorter that AC, while BC is 3 cm. longer than AC. If the perimeter of the triangle is 48 cm. find the lengths of the three sides.