Find the smallest value of x such that x^2 + 10x + 25 = 18.
x^2 + 10x + 25 = 18
x^2 + 10x + 7= 0
x = [ -10 - sqrt ( 10^2 - 4 * 7 * ) ] / 2 =
(-10 - sqrt (72) ) /2 =
(-10 - 6sqrt 2) / 2 =
-5 - 3sqrt (2) ≈ .757
Nice solution, just one small correction.
x^2 + 10x + 7 = 0
-10 +- sqrt(10^2 - 4*7*1)
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2
-10 +- 2sqrt(18)
-5 - sqrt(18) = -9.242, not .757
I believe -.757 is the other solution.
=^._.^=
