SOLUTION: Give exact and approximate solution to three decimal places. (x+5)^2=4. I don't under stand the three decimal places

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: Give exact and approximate solution to three decimal places. (x+5)^2=4. I don't under stand the three decimal places       Log On


   

Question 430407: Give exact and approximate solution to three decimal places. (x+5)^2=4. I don't under stand the three decimal places
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!
(x+5)^2=4
=> x^2 + 10x + 25 = 4
=> x^2 + 10x + 21 = 0
=> x^2 + 7x + 3x + 21 = 0
=> x(x+7) + 3(x +7) =0
=> (x+3)(x+7) = 0
so, x = -3 or x= -7