maddieburon
maddieburon maddieburon
  • 21-08-2020
  • Mathematics
contestada

2x squared minus 1 equals 21​

Respuesta :

ricchad
ricchad ricchad
  • 21-08-2020

Answer:

x = √11

Step-by-step explanation:

2x² - 1 = 21

add 1 to both sides

2x² - 1 + 1 = 21 + 1

simplify

2x² = 22

x² = 22 / 2

x = √11

Answer Link
Treasurelinus
Treasurelinus Treasurelinus
  • 21-08-2020

Answer:

x = √11

Step-by-step explanation

2x² - 1 = 21

negative sign crossing an equal to sign becomes a positive sign

2x² - 1  = 21 + 1

2x² = 22

x² = 22 / 2

x = √11

Answer Link

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