Asked by Deb
Due to my child being injured I missed this lecture at class. I am so lost now I read the chapter books but lets face it they don't make those in english.
Write a function in factured form, then inexpanded polynomial form, having as zeros 2, -1 and 1 (plus and minus) SQroot of 5
please I need help
Write a function in factured form, then inexpanded polynomial form, having as zeros 2, -1 and 1 (plus and minus) SQroot of 5
please I need help
Answers
Answered by
drwls
The factored form is:
(x-2)(x+1)(x-1-sqrt5)(x-1+sqrt5)
Note that one factor is zero at each "root" where the whole equation is zero.
Multiply it out for the expanded form. Hint: The last two terms multiply together to give (x-1)^2 - 5 = x^2 -2x -4.
(x-2)(x+1)(x-1-sqrt5)(x-1+sqrt5)
Note that one factor is zero at each "root" where the whole equation is zero.
Multiply it out for the expanded form. Hint: The last two terms multiply together to give (x-1)^2 - 5 = x^2 -2x -4.
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