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Find all the zeroes of each equation. x^3 – x^2 + 5x – 5 = 0
 one year ago
 one year ago
Find all the zeroes of each equation. x^3 – x^2 + 5x – 5 = 0
 one year ago
 one year ago

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kirk.freedmanBest ResponseYou've already chosen the best response.1
Someone please help, how do I do this?
 one year ago

RadEnBest ResponseYou've already chosen the best response.1
the sum of all coefficients be 0 (11+55=0) it means x=1 is the root or (x1) is one of the factor that polynomial find the other factor by using synthetic division, then for zeroes take all factors be 0 and solve for x
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.1
So I got x^2+5 When I used synthetic division. What now?
 one year ago

sirm3dBest ResponseYou've already chosen the best response.0
equate it to zero and use the quadratic formula.
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.1
Oh wait so if I have x^2+5=0 then x=i sqrt 5? That's one of my answers?
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.1
These Are the possible answers btw dw:1354664328662:dw
 one year ago

RadEnBest ResponseYou've already chosen the best response.1
just to check the value of D(discrimininant) with D=b^24ac D=0^24*1*5=20 it means no solution for x real, but if u want representing x to in complex number use the quadratic formula : x=[b + sqrt(b^24ac)]/(2a)
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.1
What is a,b, and c for the quadratic formula?
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.1
is it 1,1, and 5?
 one year ago

RadEnBest ResponseYou've already chosen the best response.1
actually the general form a quadratic equation is ax^2 + bx + c = 0 so given x^2 + 5 = 0 it means a=1, b=0, c=5
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.1
But the original formula is x^3 – x^2 + 5x – 5 = 0 wouldn't b be 5 since it's 5x?? I'm confused there.
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.1
Where do you get the x^2+5=0 formula?
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.1
Oh nvm, I got it. Thanks for the help!
 one year ago

sirm3dBest ResponseYou've already chosen the best response.0
you have all the answers. your answer should be A.
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.1
Yes, that's what I put and got it right:) Thanks
 one year ago
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