I am in 7 grade math

label Mathematics
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if f(x) + ( square root sign) x+4, for what of x does f(x) = 3? 

Jan 15th, 2015

f(x)=square root (x+4)

so what we want to do is make the function equal to the value of 3, so that we can solve for x

so we have

3=(sqaure root) x+4

Now, how do we solve for x since we have that big annoying square root? We simply square both sides.  Squaring both sides will cancel the square root, leaving

9=x+4

Now, simple isolate x by subtracting 4 on both sides

9-4=x+4-4

so x=5

Now, just to check, plug x=5 back into the original equation.  Does it equal 3? YES!

Jan 15th, 2015

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