Use synthetic substitution to evaluate P(x) = x3 + 3x2 - 6 for x = 5.
P(5) =

- anonymous

Use synthetic substitution to evaluate P(x) = x3 + 3x2 - 6 for x = 5.
P(5) =

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- ash2326

airricuhh why don't you try this one? if you get stuck I'll help you

- anonymous

so you start at
5
3 3 6
and then i don't know what comes under that..

- anonymous

goes"

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## More answers

- ash2326

Let me teach you,

- anonymous

\[5^3+3(5^2)-6=194\]

- anonymous

got it?

- anonymous

no i don't saljudieh,

- ash2326

we have x=5, it means we are dividing by x-5 to get the value of P(5)
write the coefficients of P(x)= x^3+3x^2-6
coefficients are 1 3 -6

- ash2326

got till here?

- anonymous

where did you get the 1 coefficient from? the x right?

- ash2326

yeah x^3 = 1
3x^2= 3
-6 as it is

- anonymous

okay, so where do you get the numbers that go under neath,

- ash2326

now we are using synthetic division
first step
write this way
_______________
5 | 1 3 -6

- anonymous

wait ash, i messed up the problem was Use synthetic substitution to evaluate P(x) = x3 + 3x2 - 6 for x = -1.
P(-1) =

- ash2326

now we have
_______________
5 | 1 3 -6
bring the first term 1 as it is down ,
_______________
5 | 1 3 -6
1
next multiply , the term brought down by 5 and
____________________________
5 | 1 3 -6
5(5*1)
1

- anonymous

:/ im sorry, so it would be
_______________
-1 | 1 3 -6

- ash2326

no we have to evaluate at x=5 so it's
_______________
5 | 1 3 -6

- anonymous

i know but i typo'd the problem its P(-1)
:/

- anonymous

so it would be 3
5
which is 15
so then would i divide 15 by -6 and get the answer?

- anonymous

hey arricuhh u wanna learn?
watch thishttp: http://www.youtube.com/watch?v=-aTMzg4syy8

- anonymous

well thanks.

- anonymous

did it help?

- anonymous

so is the answer -8 ?

- anonymous

nope, it did help. but i still got the wrong answer.

- anonymous

wait is it -5?

- anonymous

|dw:1328504343410:dw| ok look at this:

- anonymous

\[x^3+3x^2(no x so you PUT ZERO) -6\]you were messing a term of zero instead of the x term..
coz you had

- anonymous

saljudieh07 i messed up tho and the question is Use synthetic substitution to evaluate P(x) = x3 + 3x2 - 6 for x = -1.
P(-1) =
i accidently put 5. im going to try it again because i forgot the 0.

- anonymous

yeh whe you have the zero it will work

- anonymous

gdluck i g2g for now byee

- anonymous

okay thank you! (:

- nenadmatematika

is that really you on the picture?

- anonymous

yea,

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