Unit 7 Test Review

What are the solutions to the equation -2x² -6x + 80? ​ ​ ​

• - 6
• 7

• -8
• 5

Which value of x is the solution to this equation?

5x² = 30x - 45

​ ​

• x = 3
• x = 5
• x = -3
• x = -5

What is the positive solution to x² + 9x - 22 = 0?

What is the solution set for the quadratic equation x² - 49 = 0?

• {7}

• {-7,7}

• {240}

• {-240,240}

What are the solutions to the equation 3x² -30x -72 = 0?

• x= -3 and x= -2

• x= -2 and x= 12

• x= 6 and x= 13

• x= 0 and x= 1

A baseball player tosses a ball straight up into the air. The function -16x² + 30x + 5 = 15 models the motion of the ball, where x is the time in seconds and y is the height of the ball in feet. Use the quadratic formula to solve the equation. Round to the nearest tenth.

The ball is at a height of 15 ft at __ seconds and __ seconds.

• 0.4
• 1.4
• 2.4
• 3.4
• 4.4

A projectile is thrown into the air. The equation x² -4x + 4 = 0 represents the path of the projectile, where x represents the amount of time in seconds. How long is the projectile in the air, in seconds?

√98

• 7√2

• 2√7

• √8

• √49

2√700

• 10√7

• 20√7

• 2√5

• √7

What is the next step in the solution to this quadratic equation?

Solve x² -6x +12 = 0

Step 1: Identify A, B, C a= 1 b= -6 c= 12

Step 2: Substitute these values into the quadratic formula.

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