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Naddik [55]
3 years ago
12

What is the solution of sqrt x+12=x ? x = –3 x = 4 x = –3 or x = 4 no solution

Mathematics
2 answers:
icang [17]3 years ago
8 0
\left[x _{2}\right] = \left[ 4\right][x​2​​]=[4] totally value
Alexeev081 [22]3 years ago
7 0

x = 4 is the solution

given \sqrt{x+12} = x ( square both sides )

x + 12 = x² ( rearrange into standard form )

x² - x - 12 = 0 ← in standard form

(x - 4 )(x + 3 ) = 0 ← in factored form

equate each factor to zero and solve for x

x - 4 = 0 ⇒ x = 4

x + 3 = 0 ⇒ x = - 3

substitute these values into the original equation and if both sides are equal then they are the solutions

x = 4 : \sqrt{4+12} = \sqrt{16} = 4 = x ← correct

x = - 3 : \sqrt{-3+12} = \sqrt{9} = 3 ≠ - 3 ← false

the solution is x = 4


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