rodrigueza2942
rodrigueza2942 rodrigueza2942
  • 04-08-2018
  • Mathematics
contestada

Solve 5r2 – 12 = 68. {±4} {±5} {±3} {±6}

Respuesta :

PunIntended
PunIntended PunIntended
  • 04-08-2018

Add 12 to both sides:

5r^2 = 80

Divide by 5:

r^2 = 16

Square root both sides:

r = +/- 4

The answer is {+/- 4}.

Answer Link
coolcat3390
coolcat3390 coolcat3390
  • 04-08-2018
5r2-12=68
+12 +12
5r2 = 80
-80
5r2 -80 = 0
÷5 ÷5 ÷5

r2 -16 = 0
+16 +16
r2 = 16

root: r2 = root: 16
r = {+/- 4}
Ver imagen coolcat3390
Answer Link

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