Solving Quadratic Equations - (2019)

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

b² + b = 6

• b = 2 and -3
• b = -2 and 3
• b = -2 and -3
• b = 2 and 3 

n² - 2n = 0

• n = 2 and 0
• n = -2 and 0
• n = 2
• n = 0

b² -12b = -35

• b = 5 and 7
• b = -5 and -7
• b = -5 and 7
• b = 5 and -7

x² + 18x +27 = 8x +3

• x = -6 and -4
• x = 6 and 4
• x = -6 and 4
• x = 6 and -4

x² - 64 = 0

• 64
• 8
• 8 or -8
• 1 or -64

• 81, -81

• 9, -9

• 3, -3

• No real solution

• -3, 4
• 3, 4
• -4, -3
• -3

Solve the quadratic equation by factoring
a² + 10a + 21 = 0

• ± √21
• -3 , -7
• 3 , 7
• 28 , -7

Tags

CCSS.HSA.APR.B.3

CCSS.HSA.REI.B.4

Solve by factoring

• -6, -2
• -2, 6
• 2, 6
• -6, 2