T1nydancer
T1nydancer T1nydancer
  • 25-02-2019
  • Mathematics
contestada

r^2+8r=-7
solve the equation with the quadratic formula showing work

Respuesta :

marshmellmoe marshmellmoe
  • 05-03-2019

Answer:

Step-by-step explanation:

r²+8r=−7

Step 1: Subtract -7 from both sides.

r²+8r−(−7)=−7−(−7)

r²+8r+7=0

Step 2: Use quadratic formula with a=1, b=8, c=7.

r=[tex]r=\frac{-b+or-\sqrt{-4ac}  }{2a}[/tex]

[tex]r=\frac{-8+or-\sqrt{(8})^2-4(1)(7) }{2(1)}[/tex]

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