aldersontr aldersontr
  • 09-02-2021
  • Mathematics
contestada

How is this solved?
r2 + 2r = 80

Respuesta :

DeepakThakur
DeepakThakur DeepakThakur
  • 09-02-2021

Answer:

8,-10

Step-by-step explanation:

r²+2r=80

r²+2r-80=0

r²+(10-8)r-80=0

r²+10r-8r-80=0

r(r+10)-8(r+10)=0

(r-8)(r+10)=0

either, or,

r-8=0 r+10=0

r=8 r=-10

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