book Maths Puzzle Numerical Ability

The directions say to use the quadratic formula to find the roots of the following polynomials:
a) 6x^2-6-5x
b) 6x^2-6x-5
but no matter how i solve it all my soloutions are inc

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book Other Question

Simplify the following expression as mucch as possible:
Assume that all variables represent positive real numbers.

t^2 square root of 8tx^2 - x square root of 18t^5
What number decreased by 3.5 equals 12.7