Question 996998
{{{sqrt(x+15)-x=3}}} I should start by adding x to both sides so the equationb now looks like this: {{{sqrt(x+15)=3+x}}} at this time, I square both sides to look like this: {{{sqrt(x+15)^2=(x+3)^2}}} Since the squares eliminate themselves on the left, I foil the right so the equation looks like this:
x+15=x^2+6x+9.
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Subtract (x+15)
{{{x^2 + 5x - 6 = 0}}}
(x + 6)*(x - 1) = 0
x = 1
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x = -6 (works if you use sqrt(9) = -3)