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anonymous
 one year ago
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?
anonymous
 one year ago
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?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes, he didn't factor the 2 out correctly

dinamix
 one year ago
Best ResponseYou've already chosen the best response.0f(x) =2x^216x+5 this equation i think the answer is line 3

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh wait, sorry. That factoring mistake is on line 1, not 2.

dinamix
 one year ago
Best ResponseYou've already chosen the best response.0yup this @peachpi and he didnt right the correct must will f(x) = 2x^216x+5 and the aswer line 3

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\(2x^28x\) = \(2(x^24x)\) is what I meant

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0they're asking you to find the mistake. The mistake is that the factoring on line 1 was wrong.

dinamix
 one year ago
Best ResponseYou've already chosen the best response.0all lines is wrong @peachpi

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes, they're all wrong. But the mistake first happened on line 1

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh, alright, I see where you guys are coming from

dinamix
 one year ago
Best ResponseYou've already chosen the best response.0i think he made mistake in f(x) = 2x^28x+5 and should be 2x^216x+5 peachpi

dinamix
 one year ago
Best ResponseYou've already chosen the best response.0and the lines will be all correct

dinamix
 one year ago
Best ResponseYou've already chosen the best response.0did understand me @peachpi

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No. 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
 one year ago
Best ResponseYou've already chosen the best response.0yup he did write it correct thats problem

dinamix
 one year ago
Best ResponseYou've already chosen the best response.0u didnt understand me if the function f(x) = 2x^216x+5 we all lines correct right ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No, because changing 8 to 16 changes the function. This is the correct solution to the problem, with no mistakes \(f(x)=2x^28x+5\) \(f(x)=2(x^24x)+5\) \(f(x)=2(x^24x+4)+58\) \(f(x)=2(x2)^23\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Is he getting confused with the actual function? Hes really confusing me

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yeah 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
 one year ago
Best ResponseYou've already chosen the best response.0He didn't divide the 8x by the 2 you're factoring?

dinamix
 one year ago
Best ResponseYou've already chosen the best response.0@gigirained are really this function f(x) = 2x^28x+5 are u sure its 8x not 16x ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes correct @gigirained

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@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
 one year ago
Best ResponseYou've already chosen the best response.0ok he did mistake , didnt divide 8x by 2

dinamix
 one year ago
Best ResponseYou've already chosen the best response.0yup @peachpi this why i check if write function correct or no

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Thanks you guys, @peachpi and @dinamix
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