Solving Quadratics (method 1-3)

x² = 16

• ± 4
• ± 8
• 4
• 8

-5x² = -50

• ± 5
• ± 10
• ± √10
• -10

7x² + 1 = 8

• ± 1
• ± 7
• ± √7
• ± 8

(x + 1) ² = 25

• ± 5
• 4  or  -6
• -4  or  6
• ± 4

Solve by taking square roots:
k² - 6 = 43

• k = √37
• k = 37 or - 37
• k = 7, k = -7
• no solution

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

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

Write the question and show all work.
(x-5)² = 25

• ±0
• ±10
• 10, 0
• -10, 0

What are the factors of 3x²-17x+10

• (x-5)(3x-2)
• (x+5)(3x+2)
• (3x-5)(x-2)
• (x+5)(3x-2)

Solve
2x² + 17x + 21 = 0

• x= ^-21/₂, -17
• x= ²/₃, 16
• x=-7, ^-3/₂
• x=15, -³/₇

What should you do first in solving this equation?
x² + 6x - 13 = 3

• Get factored form
• Write down: a=1, b=6, c=-13
• Make it equal 0 by subtracting 3 on each side
• Type it all in a calculator.