exam Maths Puzzle Numerical Ability

It's on page 85.I just need someone to show me step by step how to get the answer.

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exam Other Question

If the discriminat is negative, would this be a true statement?

The discriminant is negative, so the quadratic has no real-valued zeroes and therefore no solution.
Simplify:

y to 0power x -8power/x -7power z( (y 5power)-2power/(z to 0 power) 9power - x 11power/y4power)