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
eighty liters of a 40% antifreeze solution had to be strengthened so it contained 52% antifreeze. how much should be added? Which of the following is likely to be found in most non-simple-polynomial rational functions?

A horizontal asymptote
Vertical asymptotes
Roots
A defined value at x =