Answer:
1. -8, -7
2. 7, -8
Step-by-step explanation:
1. -Factoring-
x² + 15x + 56 = 0
^
8•7
(x+8)(x+7) = 0
x+8=0
x1= -8
x+7=0
x2= -7
2. -Quadratic Formula-
x² + x - 56
a= 1, b= 1, c= -56
x= -1 +- √1 - 4(1)(-56)/2(1)
x= -1 +- √1 + 224/2
x= -1 +- √225/2
x= -1 +- 15/2
x1= -1 + 15 = 14/2 = 7
x2= -1 -15 = -16/2 = -8
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Answers & Comments
Answer:
1. -8, -7
2. 7, -8
Step-by-step explanation:
1. -Factoring-
x² + 15x + 56 = 0
^
8•7
(x+8)(x+7) = 0
x+8=0
x1= -8
x+7=0
x2= -7
2. -Quadratic Formula-
x² + x - 56
a= 1, b= 1, c= -56
x= -1 +- √1 - 4(1)(-56)/2(1)
x= -1 +- √1 + 224/2
x= -1 +- √225/2
x= -1 +- 15/2
x1= -1 + 15 = 14/2 = 7
x2= -1 -15 = -16/2 = -8