Solving Quadratic Equations: Quadratic Formula — Unit test Answers

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Which point is an x-intercept of the quadratic functionf(x) = (x – 8)(x + 9)?

(0,8)

(0,–8)

(9,0)

(–9,0)

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The sum of a number and its square is 42. Which equation can be used to find the two numbers for which this is true?

x2 + x = 42

x2 + 2x = 42

x2 + x + 42 = 0

x2 + 2x + 42 = 0

Which equation results from taking the square root of both sides of (x – 9)2 = 81?

x – 9 = ±9

x + 9 = ±9

x + 3 = ±9

x – 3 = ±9

What is the equation of the axis of symmetry of the graph of y + 3x – 6 = –3(x – 2)2 + 4?

Option

What are the solution(s) of the quadratic equation 98 – x2 = 0?

x =

no real solution

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