Wednesday, December 10, 2014

Solve for x : x^2 - 5x + 6 =

To solve the inequality above, first we have to calculate
the roots of the equation x^2 - 5x + 6 = 0.


After finding
the roots of the equation, we could write the expression in a factored form
as:


1*(x-x1)(x-x2) =<
0


So, let's apply the quadratic formula to calculate the
roots:


x1 =
[5+sqrt(25-24)]/2


x1 =
(5+1)/2


x1 =
6/2


x1 =
3


x2 =
(5-1)/2


x2 =
4/2


x2 =
2


The inequality will be written
as:


(x - 3)(x - 2) =<
0


Now, we'll discuss the
inequality:


- the product is  negative if one factor is
positive and the other is negative:


x -
3>=0


We'll add 3 both
sides:


x >
=3


and


x - 2 =<
0


x =< 2


The common
solution is the empty set.


Now, we'll consider the other
alternative:


x - 3 =<
0


x =<
3


and


x - 2 >=
0


x >= 2


So, x belongs
to the interval [2 , 3].


Finally, the
solution of the inequality is the inetrval identified above:
[2 , 3].

No comments:

Post a Comment

Comment on the setting and character of &quot;The Fall of the House of Usher.&quot;How does setting act as a character?

Excellent observation, as it identifies how the settings of Poe's stories reflect the characters of their protagonists. Whet...