Question

What is
`(x-21)^(2) =28` in simplifed radical form (if necessary)?

Answer 1

`x = 26.3 \: or \: x \: = 15.7`

Explanation:

`(x - 21) ^(2) = 28`

`(x - 21)(x - 21) = 28`

`{x}^(2) - 42x + 441 = 28`

`{x }^(2) - 42x + 441 - 28 = 0`

`{x}^(2) - 42x - 413 = 0`

Answer 2

Explanation:

x=21+2√7

or

x=21-2√7