Solving Quadratic Equation by Extracting Square Roots

1. Which of the following quadratic equations can be solved by extracting square roots?

• x² + 3x – 4 = 0

• x² – 36 = 0

• (x + 1) (x – 3)

• 2x² – 5x – 7 = 0

What is the solution of the equation a² – 60 = 21?

• positive or negative 4

• positive or negative 6

• positive or negative 7

• positive or negative 9

Which of the following has a solution of x = 5?

• x² – 5 = 0

• x² – 50 = 0

• 2x² – 50 = 0

• 2x² – 10 = 0

How many real solution/s or root/s does the equation

n² = 0?

• 0

• 1

• 2

• 3

John is solving for equation (3y – 3)² – 144 = 0 by extracting square roots. Which of the following solution will arrive?

• 5 and –3

• –5 and 3

• 7 and –4

• –12 and 3