b_crazy_101 asked:
For example, if you are factoring: 2x^2 - x - 6 how do you know if it should be (2x+3)(x-2) or if it the last two numbers should be reversed like (2x-2)(x+3)? Also, how do you know which numbers are positive and which negative, what are the rules of the signs?
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For example, if you are factoring: 2x^2 - x - 6 how do you know if it should be (2x+3)(x-2) or if it the last two numbers should be reversed like (2x-2)(x+3)? Also, how do you know which numbers are positive and which negative, what are the rules of the signs?
Small businesses seeking information on how Hudson Commercial Capital can help during this financial crisis can call 1.212.564-0031 or can visit
Tags: Factoring, Parenthesis, Signs
(2x + 3)(x - 2) multiply 2(-2) and 3(1), -4, 3,
add and you get -1..this is correct because you want -1x as your middle
term.
There’s a very quick way, let’s try an expanded binomial square:
x^2 - 5x + 6
First make the two binomials –> x^2- 5x + 6 = (x ) (x )
with the srqt of first term
The signs are like this always:
-) In the first binomial goes the same sign that the second term
so (x - ) (x )
-) In the second binomial goes the multiplication of second and third term signs, that means - * + = -
Finally you get –> (x - ) (x - )
Remember to put first the bigger number in absolute value, of course.
Good Luck!!!
P.D: you’ll get (x - 3)(x - 2) at the end
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