Solving Quadratics

Solve
a² + 2a - 24 = 0

• a = -6, 4
• a = 6, -4
• a = 12, -2
• a = 8, -3

Tags

CCSS.HSA-REI.B.4B

Solve by taking square roots:
k² - 6 = 43

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

Tags

CCSS.HSA-REI.B.4B

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

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

Tags

CCSS.HSA-REI.B.4B

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.

Tags

CCSS.HSA-REI.B.4B

• √3
• ±√3
• -3
• No real solution

Tags

CCSS.HSA-REI.B.4B

Solve the equation using the zero product property.

(x- 9)(x + 3) = 0

• x = 3 or x = 9

• x = 3 or x = -9

• x = -3 or x = 9

• x = -3 or x = -9

7x² + 1 = 8

• ± 1
• ± 7
• ± √7
• ± 8

Tags

CCSS.8.EE.A.2

Write the question and show all work.4x²=100

• 25
• ±25
• 5
• ±5

Tags

CCSS.8.EE.A.2

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

• ±0
• ±10
• 10, 0
• -10, 0

Tags

CCSS.HSA-REI.B.4B

• ±72
• ±12
• 12
• No real solution

Tags

CCSS.8.EE.A.2