Solving Quadratics Factor Square Root and Quadratic Formula

Solve by factoring: x² - 9x + 20 = 0

• x = -4 and x = -5
• x = 20 and x = -9
• x = 4 and x = 5
• x = -4 and x = 5

Factor: 49x² - 100

• (49x + 100)(x - 1)
• (7x - 10)(7x + 10)
• (49x - 10)(x + 10)
• (7x -10)(7x - 10)

Factor:   3x²- 6x - 24

• (3x - 8)(x + 3)
• (3x + 4)(x - 6)
• 3(x - 2)(x + 4)
• 3(x + 2)(x - 4)

7x² - 26x - 8 = 0

• x = -1 and x = -7/8
• x = 4 and x = -2/7
• x = -4 and x = 2/7
• x = 4 and x = -7/2

-5x² = -50

• ± 5
• ± 10
• ± √10
• -10

(x + 1) ² = 25

• ± 5
• 4  or  -6
• -4  or  6
• ± 4

Solve by taking square roots:
5b² - 4 = 41

• b = 9, b = -9
• b = 3, b = -3
• b = 8, b = -8
• no solution

Solve
(x+3)²-5 = 9

• -3±√14
• 3±√14
• ±11
• ±5

Solve 14 - x² = 17

• x = ±1.73
• x = 3
• no solution
• x = -3

Identify the 'a' value:
 y = 16x² - 8x - 24

• 16
• 8
• -8
• -24