Solving Quadratic Equations: Quadratic Formula — Unit test

Question 1

Solve x2 – 8x = 3 by completing the square. Which is the solution set of the equation?

Revolt · Accepted Answer

(4 minus StartRoot 19 EndRoot comma 4 + StartRoot 19 EndRoot)

Question 2

What number should be added to both sides of the equation to complete the square? x2 – 10x = 7

Question 3

Which equations are true for x = –2 and x = 2? Select two optionsx2 – 4 = 0x2 = –4 3x2 + 12 = 04x2 = 162(x – 2)2 = 0

Question 4

Which shows the correct substitution of the values a, b, and c from the equation –2 = –x + x2 – 4 into the quadratic formula?Quadratic formula: x =

Revolt · Accepted Answer

x = StartFraction negative (negative 1) plus or minus StartRoot (negative 1) squared minus 4 (1)(negative 2) EndRoot Over 2(1) EndFraction

Question 5

What are the solutions of the quadratic equation (x + 3)2 = 49?

Revolt · Accepted Answer

x = 4 and x = –10

Solving Quadratic Equations: Quadratic Formula — Unit test Answers