What is the output of the following MATLAB code?

medium📝 Predict Output Q13 of 15

MATLAB - Numerical Methods

p = [1 -3 2]; % Represents x^2 - 3x + 2
r = roots(p);

A[1 2]

B[3 2]

C[2 1]

D[-1 -2]

Step-by-Step Solution

Solution:

Step 1: Identify the polynomial
The vector p = [1 -3 2] represents the polynomial x^2 - 3x + 2.
Step 2: Find roots of the polynomial
Factoring: (x-1)(x-2) = 0 so roots are 1 and 2. MATLAB returns a column vector [2; 1], matching option [2 1].
Final Answer:
[2 1] -> Option C
Quick Check:
Roots of x^2-3x+2 = 1, 2 [OK]

Quick Trick: Roots are where polynomial equals zero [OK]

Common Mistakes:

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