Question

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

Answer 1

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

Answer 2

so you start at
5
3 3 6

and then i don't know what comes under that..

Answer 3

goes"

Answer 4

Let me teach you,

Answer 5

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

Answer 6

got it?

Answer 7

no i don't saljudieh,

Answer 8

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

Answer 9

got till here?

Answer 10

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

Answer 11

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

Answer 12

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

Answer 13

now we are using synthetic division


first step
write this way
_______________
5 | 1 3 -6

Answer 14

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

Answer 15

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

Answer 16

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

Answer 17

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

Answer 18

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

Answer 19

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

Answer 20

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

Answer 21

well thanks.

Answer 22

did it help?

Answer 23

so is the answer -8 ?

Answer 24

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

Answer 25

wait is it -5?

Answer 26

ok look at this: