Solve the equation the square root of the quantity x + 4 - 3 equals 1 for the variable. Show each step of your solution process.
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OpenStudy (michele_laino):
is your equation like this?
\[\sqrt {x + 4} - 3 = 1\]
OpenStudy (james1769):
yes
OpenStudy (michele_laino):
since we have this square root \(\sqrt {x + 4} \), then we have to request that the radical \(x+4\) has to be greater or equal than zero:
\[x + 4 \geqslant 0\]
OpenStudy (michele_laino):
since the square root of negative numbers doesn't exists
OpenStudy (james1769):
okay thanks
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OpenStudy (michele_laino):
solving that inequality we have:
\[x \geqslant - 4\]
which means that we can accept, as solutions, only those quantities which are greater or equal to -4
OpenStudy (james1769):
does the answer come out to be x=12
OpenStudy (james1769):
got one more question
OpenStudy (michele_laino):
yes! since we have to add 3 to both sides:
\[\sqrt {x + 4} = 4\]
then squaring both sides and simplifying, we get:
x=12
OpenStudy (michele_laino):
and since 12 > -4, we can conclude that x=12 is the solution of our equation
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