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sanchez626
15.07.2019 •
Mathematics
Factor x^2-6x+9 < < < need ?
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Ответ:
So to factor it, you want to see what 2 numbers will multiply and make 9 and what 2 numbers will add and make -6.
so 9 and 1 and -9 and -1 make 9 but they dont make -6.
3 and 3 and -3 and -3 make 9, but we need to see which one makes -6. that would be -3 and -3
so the answer is (x-3)(x-3)
you can foil to make sure.
x * x is x^2
-3*x=-3x
-3*x=-3x
-3x-3x = -6x
-3*-3 is 9
so it is x^2-6x+9 which makes the original equation
Hope this helps!
Ответ:
(x - 3)(x - 3) or (x - 3)²
The factors would be (x - 3) and (x - 3).
If you need help factoring, you should talk to your teacher, but here's how I do it:
1. Look at the first term and its coefficient. Think of two possible numbers that would multiply to get the first term (i.e. 3x and 2x for 6x²) and put them first in the parentheses. You can also write all possible combinations on the side. However, this time, the only combination would be x and x multiplying to get x².
(x )(x )
2. Next, look at the last term. What two numbers multiply to get 9? Remember that two negative numbers can multiply to produce a positive one too. Basically, you're looking for two numbers that multiply to get 9 and add together to get -6. You might try all of the possible combinations, but none will work. In that case, you would go back to step 1 and try a different first term. In this case, though, there's only one combination for the first places, so that won't be necessary.
(x - 3)(x - 3)
Let me know if you have any more questions.
Ответ:
4 hours
Step-by-step explanation:
if 1/4 is leaked in 1 hour it will take 4 hours for 4/4 to leak.