exam Maths Puzzle Numerical Ability

Write an algebraic expression for "three times the difference of a number x and 5"

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exam Other Question

Find the real zeros of the polynomial function P(x) = x(x + 1)(x2 - 81).
A. 0, -1, 9, -9
B. 0, -1, 9
C. -1, 9, -9
D. 0, 1, 9
Hey,
Im sooo confused on how to do this problem. Its on page 453 and its number 32. I dont have the book home with me but its the Algebra 1 Prentice Hall text. It has a city on t