iheartfood
Solve the polynomial equation...
(inside!)
Please show work!! and explain! Thanks!! :)
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iheartfood
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|dw:1352180620990:dw|
.Sam.
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You have to find one root, then use long division to factor the polynomial.
iheartfood
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can u please show me how? idk how to find it :(
.Sam.
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Are you allowed to use a scientific calculator in your exams?
iheartfood
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yes I'm allowed to :) this is a practice worksheet and i need to show my work :/ and idk how to solve much less show work lol :/
iheartfood
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do u understand how to solve this? cuz i am lost :(
.Sam.
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I would use trial an error from calculator, you key the equation into your calculator, then substitute any number for x and see if its equal to zero, if that value of x equals to zero, then that is the factor of the polynomial
.Sam.
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Ok, according to the trial an error, x=8 works, so,
f(8)=15(8)^3-119(8)^2-10(8)+16=0
.Sam.
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Now, x=8, (x-8) is a factor of that polynomial. then use this to find other factors, by long division.
iheartfood
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so, what exactly am i dividing?? and can you please type or draw out all the work in order?? :) i understand better that way :)
.Sam.
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You are dividing (x-8)
.Sam.
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Because x=8 for the f(x) is zero
iheartfood
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okay, so I'm dividing 15x^3-119x^2-10x+16 divided by x-8?
.Sam.
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Yes
iheartfood
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k i got 15x^2+x-2... so is that my answer?? :)
iheartfood
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@.Sam. is that my answer???
.Sam.
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yes
iheartfood
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kk thanks! :)
iheartfood
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can u pls help me with another one>? :)
.Sam.
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But if they tell you to solve, that means you have to find x from 15x^2+x-2
.Sam.
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Use factor or quadratic equation or completing the square to solve 15x^2+x-2
iheartfood
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kk thanks!! :)
.Sam.
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welcome