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Chanel Booth
Mathematics
20 August, 04:08
F (x) = 3x^2-18x+27
can you solve this?
+5
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2
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Gianna Camacho
20 August, 04:16
0
I can factor it
3x^2 - 18x + 27
= 3 (x^2 - 6x + 9
= 3 (x - 3) ^2
If we equate this to 0 we can solve for x:-
3 (x - 3) ^2 = 0
so x - 3 = 0
and x = 3 (duplicity 2)
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Reyna Cole
20 August, 04:21
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What do you mean by "solve this?" Until you set f (x) = to some constant number, you don't have an equation and thus can't expect to find solutions.
Why don't we take 3x^2-18x+27 and set it = to 0, and only then try to solve this equation?
3x^2-18x+27 = 0. Dividing both sides by 3, we get x^2 - 6x + 9 = 0, which can be factored as
(x-3) ^2 = 0. Taking the sqrt of both sides, we get x-3 = 0. Actually, there are 2 roots: 3 and 3. Again, this statement is true only if we set 3x^2-18x+27 = to 0.
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