Question

Citytech Mech 1240 Midterm Exam #2A Spring 2019 1H 10 min Circle the most appropriate answer or answer the question S. Left division is: k-113:7 used to find the remainder the same as right division cused to solve a system of linear 1234567 b. 136 a. b. c 147 d. The column vector 1 37 equations 2. To solve the equation x+4x+5-0, and d. just another word for division given the array a- [1,4, 5 ] your command would be: Consider the two following equations 6. 8x-3y-1 6x+4y 32 a. poly(a) b. polyfit(a) How will you compose arrays to solve this system of equations? a. A [8, -3,1]: B 16, 4, 32] c. roots(a) d. polyval (a) What is the array for the coefficients of the polynomial 2x3+3x +5 a. 12,3,0,5] 3. c. A-[8, 6; 3,4): B-|132] d. A- [8, -3:6,4; B [1:32] How will you solve the equations given in question 6? a, C=A/B b. 12,0,3,5 7. c. 12.3,5 d. [2.0,0,3,5) 4, x # [4,-5, e, c. 45] ; d. C roots(A,B) y find(x) a, y 4.5 45 8. If a is a row vector 1 3 5, what would be b. y 142-5 4 45 the result of b-[a' a' a] cy 4-5 0 45 d y-124

Answer 1

Answers)

1) Option c) is correct ; As [Start value : Incrementer : End Value]

so [1 : 3 : 7] = [1 (1 + 3) 7] = [ 1 4 7 ]

2) Option c) is correct ; a = [1, 4, 5]; roots(a); gives the values of a that satisfies the equation

3) Option b) is correct ;The Array Coefficients are [2 0 3 5]

4) Option d) is correct ;

x = [4, -5, 0, 45];
y = find(x)
y =

   1   2   4

5) Option c) is correct ; The left division reverse the division, meaning i.e 8 \ 4 = 4 / 8. This can be used to solve linear equations

6) Option d) is correct ;

A = [8, -3 ; 6 4];
B = [1 ; 32];

7) Option c) is correct ;

A = [8, -3 ; 6 4];
B = [1 ; 32];
C = A\B

C =

   2
   5

The value of x = 2; and value of y = 5