book Maths Puzzle Numerical Ability

i am having trouble getting all the information needed to solve the followsing polynomial function
for the function f(x)=x^2-2x-15 determine each of the following:
*turns upwa

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book Other Question

what does 5 to the negative 4th power equal? Now this is a challenge for me. the question reads, write an equation in slope-intercept form of the line that passes through a given point and is perpendicular to the graph of each equation. problem #33 is (6, -13), 2x - 9y = 5