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1 vote
1 vote

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

User CoreyStup
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2 Answers

16 votes
16 votes
x= 10
x= -10

Use the quadratic formula to show your work.
User Hastur
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12 votes
12 votes


\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

User Madgen
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