ackimberlin ackimberlin
  • 23-04-2018
  • Mathematics
contestada

Find the value of the lesser root of x2 - 8x + 7 = 0

A) -1
B) 1
C) 3
D) 5

Respuesta :

MsEHolt MsEHolt
  • 03-05-2018
The correct answer is B) 1.

We can factor this first.  We want factors of 7 that sum to -8; -7(-1) = 7 and -7+-1 = -8:
(x-1)(x-7)=0

Using the zero product property, we know that either x-1=0 or x-7=0.  This gives us x=1 or x=7.
Answer Link
caitlynrose2604 caitlynrose2604
  • 07-03-2019

Answer:

The correct answer is B

We can factor this first.  We want factors of 7 that sum to -8; -7(-1) = 7 and -7+-1 = -8:

(x-1)(x-7)=0

Using the zero product property, we know that either x-1=0 or x-7=0.  This gives us x=1 or x=7.

Step-by-step explanation:

Answer Link

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