Posted by Shreya on Wednesday, January 18, 2012 at 9:40pm.
solve equation x^22x6 using quadratic formula. i not get how to do this and it says quadratic formula.

mathcalculus  math1, Wednesday, January 18, 2012 at 10:10pm
you cannot solve it since you cant square root a negative number... unless 2x was positive 2x.

mathcalculus  Shreya, Wednesday, January 18, 2012 at 10:41pm
sorry i missing part of question whole question be x^22x6 = 4. and answer have to be 1+sqrt3, 1+sqrt11 i just not get how to get this.

mathcalculus  Steve, Thursday, January 19, 2012 at 10:02am
f(x) = x^2  2x  6 has roots 1±√7 = 1.65,3.65
Between the roots, f(x) < 0 and we have
(x^22x6) = 4
x^2  2x  2 = 0
x = 1±√3
both those values are in the interval, so they're ok as solutions
Outside that interval,
x^22x6 = 4
x^2  2x  10 = 0
x = 1±√11
both those values are outside the interval, so they're ok as solutions
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