{x}^(2) - 21 = 79 plz help it's due it 2 min​

Question

`{x}^(2) - 21 = 79`
plz help it's due it 2 min​

Answer 1

x= 10
x= -10

Use the quadratic formula to show your work.

Answer 2

`\qquad \qquad\huge \underline{\boxed{\sf ᴀɴsweʀ}}`

Let's solve ~

`\qquad \sf  \dashrightarrow \: {x}^(2) - 21 = 79`

`\qquad \sf  \dashrightarrow \: {x}^(2) = 79 + 21`

`\qquad \sf  \dashrightarrow \: x {}^(2) = 100`

`\qquad \sf  \dashrightarrow \: x = \pm√(100)`

`\qquad \sf  \dashrightarrow \: x = \pm √(10 * 10)`

`\qquad \sf  \dashrightarrow \: x = \pm10`