Respuesta :

brydson247ousaq6

Answer:

Step-by-step explanation:

x=21+2√7

or

x=21-2√7

michealfemi306

Answer:

[tex]x = 26.3 \: or \: x \: = 15.7[/tex]

Step-by-step explanation:

[tex](x - 21) ^{2} = 28 [/tex]

[tex](x - 21)(x - 21) = 28[/tex]

[tex] {x}^{2} - 42x + 441 = 28[/tex]

[tex] {x }^{2} - 42x + 441 - 28 = 0[/tex]

[tex] {x}^{2} - 42x - 413 = 0[/tex]

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