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MTH603 Assignment No. 3 Solution and Discussion Spring 2017 Due Date: July 19, 2017

Assignment # 2

MTH603 (Spring 2017)

Total marks: 20
Lectures # 23 - 28
Due date: 19-07-2017

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Question#1 Marks 10

Find an equation of a cubic curve which passes through the points

(0, -1), (0, -4), (1, 5) and (2, -6) using Divided Difference Formula.

Question#2 Marks 10

Find interpolation polynomial by Lagrange’s Formula, with the help of following table,

x 1 2 3 5

0 7 26 124

And hence find value of .

Question#3 Marks 10

Find from the following table,

x 1.3 1.6 1.9 2.2 2.5

2.4 2.9 3.2 4.7 6.4

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Replies to This Discussion

i don't understand the simplification part

3+(x+1)(-7) = 3 - 7x -14 ?
it should be 3-7x-7 ?

3 - 7x -14        +   8x2 + 8x      + (x2+x)(x-1)(-6)
this step is wrong..

it is 3-7x-7

Solution:
The value of table for X and Y

 X Y 1 x0=1 2 x1=2 3 x2=3 5 x3=5 0 y0=0 7 y1=7 26 y2=26 124 y3=124

Langrange's Interpolating Polynomial
The value of x at you want to find Pn(x):x=4

Y(4)=(4-2)(4-3)(4-5)(1-2)(1-3)(1-5)×0+(4-1)(4-3)(4-5)(2-1)(2-3)(2-5)×7+(4-1)(4-2)(4-5)(3-1)(3-2)(3-5)×26+(4-1)(4-2)(4-3)(5-1)(5-2)(5-3)×124

Y(4)=(2)(1)(-1)(-1)(-2)(-4)×0+(3)(1)(-1)(1)(-1)(-3)×7+(3)(2)(-1)(2)(1)(-2)×26+(3)(2)(1)(4)(3)(2)×124

Y(4)=-2-8×0+-33×7+-6-4×26+624×124

Y(4)=63

it should be
Y(4)=(4-2)(4-3)(4-5)/(1-2)(1-3)(1-5)×0+(4-1)(4-3)(4-5)/(2-1)(2-3)(3-5)×7

can you please explain question 2 simplification ?

this qs is wrong.first find the polynomial i.e equation nd then put value of x=4 answer will be 63

i solve the question but my answer is different i wanna compare and understand.

Question No. 2

Question No. 3

y'(2.5)=2.8889 and

y''(2.5)= -25.370

for question no. 2 my answer is 59.5 i have issue in last two lines of simplification. can you share simplification step by step in last two lines

bhai full solution share kr do plzzzz

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