Solving Quadratic Equations

Solve the equation by square roots. x² = 324

• x = ±18
• x = ±25
• x = ±20
• x = ±15

Solve the equation by square roots. x² - 81 = 0

• x = ±7
• x = ±10
• x = ±12
• x = ±9

Solve the equation by square roots. 5x² - 180 = 0

• x = ±6
• x = ±12
• x = ±8
• x = ±10

Solve the equation by square roots. 13x² - 3 = 4209

• x = ±18

• x = ±13

• x = ±81

• x = ±9

Solve the equation by square roots. 2x² - 2 = 6

• x = ±2
• x = 0
• x = -3
• x = 4

Solve the equation by square roots. 3(x - 1)² = 27

• x = -2 or x = 4

• x = -2

• x = 4

• x = 9 or x = -9

Solve the equation by factoring. x² - 64 = 0

• x = -10, 10
• x = -8, 8
• x = -6, 6
• x = -12, 12

Solve the equation by square roots. 8x² - 2x - 18 = -15

• x = 0 or x = -6
• x = 3 or x = -4
• x = 3/4 or x = -1/2

• x = 2 or x = -9

Solve the equation by factoring. 7x² = -28x

• x = 2, x = -10
• x = 5, x = -7
• x = 1, x = -5
• x = 0, x = -4

Solve the equation: 2x² +3x + 1 = 0

• x = 2 or x = 3