exam Maths Puzzle Numerical Ability

PROBLEM:
SOLVE THE INEQUALITY AND WRITE THE SOLUTION IN INTERVAL NOTATION.
2x^2+8x-10>0

****I KNOW HOW TO SOLVE AN INEQUALITY BUT THIS ONE IS A LITTLE HARDER THAN USUAL...
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exam Other Question

If P(4,-5) is a point on the graph of the function y = f(x), find the corresponding point on the graph of y = 2f(x-6) Pipe A can fill a tank in 8 hours. When both A and pipe B are used th tank is filled in 5 hours. How long,in hours,would it take pipe B alone to fill the tank?