anonymous
  • anonymous
Marvin was completing the square, and his work is shown below. Identify the line where he made his mistake. f(x) = 2x^2 − 8x + 5 Line 1: f(x) = 2(x^2 − 8x) + 5 Line 2: f(x) = 2(x^2 − 8x + 16) + 5 − 32 Line 3: f(x) = 2(x − 4)^2 − 27 Line 1 Line 2 Line 3 He did not make any mistakes I think line 2, amirite?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
yes, he didn't factor the 2 out correctly
dinamix
  • dinamix
f(x) =2x^2-16x+5 this equation i think the answer is line 3
anonymous
  • anonymous
oh wait, sorry. That factoring mistake is on line 1, not 2.

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dinamix
  • dinamix
yup this @peachpi and he didnt right the correct must will f(x) = 2x^2-16x+5 and the aswer line 3
dinamix
  • dinamix
2(x^2-4) @peachpi
anonymous
  • anonymous
Y'all lost me
anonymous
  • anonymous
\(2x^2-8x\) = \(2(x^2-4x)\) is what I meant
anonymous
  • anonymous
they're asking you to find the mistake. The mistake is that the factoring on line 1 was wrong.
dinamix
  • dinamix
all lines is wrong @peachpi
anonymous
  • anonymous
yes, they're all wrong. But the mistake first happened on line 1
anonymous
  • anonymous
Oh, alright, I see where you guys are coming from
dinamix
  • dinamix
i think he made mistake in f(x) = 2x^2-8x+5 and should be 2x^2-16x+5 peachpi
dinamix
  • dinamix
and the lines will be all correct
dinamix
  • dinamix
did understand me @peachpi
anonymous
  • anonymous
No. I don't know where you're getting that. The two expressions you typed aren't equal. This problem is about completing the square, which is basically rewriting the same thing in another way. You can't just change -8x to -16x because it changes the value of the expression.
dinamix
  • dinamix
yup he did write it correct thats problem
dinamix
  • dinamix
u didnt understand me if the function f(x) = 2x^2-16x+5 we all lines correct right ?
dinamix
  • dinamix
find*
anonymous
  • anonymous
No, because changing -8 to -16 changes the function. This is the correct solution to the problem, with no mistakes \(f(x)=2x^2-8x+5\) \(f(x)=2(x^2-4x)+5\) \(f(x)=2(x^2-4x+4)+5-8\) \(f(x)=2(x-2)^2-3\)
anonymous
  • anonymous
Is he getting confused with the actual function? Hes really confusing me
anonymous
  • anonymous
yeah I think so. If you compare what I have with the solution in the problem statement, you can see the mistake on the first line
anonymous
  • anonymous
He didn't divide the 8x by the 2 you're factoring?
dinamix
  • dinamix
@gigirained are really this function f(x) = 2x^2-8x+5 are u sure its -8x not -16x ?
anonymous
  • anonymous
yes correct @gigirained
anonymous
  • anonymous
Positive its -8x
anonymous
  • anonymous
@dinamix I see what you're doing. The objective of the problem is to find the mistake, if there is one. You're finding a function that matches the steps provided. So yeah if the initial function had -16x, then the work would be correct.
dinamix
  • dinamix
ok he did mistake , didnt divide 8x by 2
dinamix
  • dinamix
yup @peachpi this why i check if write function correct or no
anonymous
  • anonymous
Thanks you guys, @peachpi and @dinamix

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