The answer to your question above, I will just illustrate it down. <span>sqrt(3 x +7 ) = 1 - sqrt(x + 2 ) </span><span>square both sides: 3x + 7 = 1 -2sqrt(x = 2) + x + 2 Then it would become like this, </span><span>2x + 4 = -2sqrt( x + 2 ) </span>Divide both sides by -2 to eliminate the -2 on the left side with sqrt. Then <span>square both sides: x^2 + 4x + 4 = x + 2 </span><span>x^2 + 3x + 2 = 0 </span><span>(x + 2) (x + 1) = 0 </span><span>x=-2, -1 there is no sqrt for-1 </span>so the answer is -2