x^2-8x=6=?
2007-05-23 05:32:03 · 3 answers · asked by Ben A 1 in Science & Mathematics ➔ Mathematics
I assume you mean x^2 - 8x + 6?
You're right...it does not factor.
2007-05-23 05:36:49 · answer #1 · answered by Anonymous · 0⤊ 0⤋
x² - 8x = 6
x² - 8x - 6 = 0
x = [8 ± â(64 + 24)] / 2
You can see that there will be a â88 coming up and since this is not a square number your trinomial will not factorise.
If you meant x² - 8x + 6 = 0 the same test can be applied..it won't factorise either.
The third possibility is that you are trying to find a number for ? so that it will factorise. In that case there would be a lot of numbers : -9, -6, -1, 6, 15 .....
2007-05-23 05:38:36 · answer #2 · answered by fred 5 · 1⤊ 1⤋
I assume you mean x^2-8x+6 =0. If so, then:
x = [8 +/- sqrt(64-4*6)]/2
x = [8 +/- sqrt(40)]/2
x = 4 +/- sqrt(10)
So the factors are (x-4-sqrt(10))(x-4+sqrt(10))
2007-05-23 05:46:48 · answer #3 · answered by ironduke8159 7 · 0⤊ 0⤋