Which Of The Following Is A Factor Of X2-5x-6?
I am reviewing for a math placement test..the choices are (x+2), (x-6), (x-3), (x-2), and (x-1)...i checked the answers and it's (x-6)...why is that? I don't understand
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asked 2 years ago
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The true factors of X2-5X-6 are (X+1),(X-6). You can simplify the factors to get the equation. Solution is as follows;
X2-6X+X-6
=X2-5x-6
X2-6X+X-6
=X2-5x-6
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X^2 -5x -6
[u need to split the 5x up to form two brackets. They need to add up to -5 and multiple to give -6, oz of 1x^2 ..the 1 times... -6]
x^2 +1x -6x -6
then u make the first bracket which has to be equal to the second so they can become one]
x(x+1) -6 (x+1)
(x-6) (x+1)
then to check multiple out.
[u need to split the 5x up to form two brackets. They need to add up to -5 and multiple to give -6, oz of 1x^2 ..the 1 times... -6]
x^2 +1x -6x -6
then u make the first bracket which has to be equal to the second so they can become one]
x(x+1) -6 (x+1)
(x-6) (x+1)
then to check multiple out.
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