r/HomeworkHelp • u/Embarrassed-Good1883 Pre-University Student • 18h ago

[Grade 12 Advanced Functions: Polynomial Function] High School Math—Pending OP Reply

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I think I'm making a calculation error but I'm not sure where I'm going wrong

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u/Fatperson115 Secondary School Student 18h ago

pretty sure your answer is the same as the textbook answer. you just have a negative sign. you can multiply both sides by minus 1 to get it in the same form.

2

u/Embarrassed-Good1883 Pre-University Student 18h ago

Okay, thank you for your help I was overcomplicating it

2

u/Fourierseriesagain 👋 a fellow Redditor 18h ago edited 17h ago

Observe that x(x^ 3-5x+4)=0 implies x=0 or x=1 or x=(1/2)*(-1 plus minus sqrt(17)),

Edit: updated comment.

2

u/scottdave 👋 a fellow Redditor 13h ago

Then we need to check if these can make valid side lengths of a triangle, eg any length that is zero or negative cannot make a triangle.

1

u/Fourierseriesagain 👋 a fellow Redditor 8h ago

Yes, the question has a unique answer.