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Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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### Complex Numbers and Quadratic Functions

#### Problem 5: Simplify a Square Root with i
- **Task:** Write and simplify \(\sqrt{-48}\); include the use of \(i\).

#### Problem 6: Find the Zeros of a Quadratic Function
- **Task:** Find the zeros of the function \(y = 2x^2 + x + 7\). Write any complex zeros with \(i\).
Transcribed Image Text:### Complex Numbers and Quadratic Functions #### Problem 5: Simplify a Square Root with i - **Task:** Write and simplify \(\sqrt{-48}\); include the use of \(i\). #### Problem 6: Find the Zeros of a Quadratic Function - **Task:** Find the zeros of the function \(y = 2x^2 + x + 7\). Write any complex zeros with \(i\).
### Polynomial Simplification and Zero-Finding

#### Exercise 1: Simplify by Multiplying
\[ (x + 6i)(x - 6i) \]

In this problem, we need to simplify the expression by multiplying the two binomials. 

#### Exercise 2: Finding a Polynomial with a Given Zero
\[ \text{Find a polynomial with zero } x = 4i. \]

In this problem, we need to find a polynomial such that \( x = 4i \) is one of its zeros. 

Note: In the second exercise, some text is unreadable due to a scribble, but the instruction is clear about finding a polynomial with a specified zero. 

### Steps for Exercise 1:

1. Distribute the terms in the binomials.
2. Apply the difference of squares formula where applicable.
3. Simplify the resulting expression.

### Steps for Exercise 2:

1. Use the fact that for a polynomial to have a non-real zero \( x = 4i \), the conjugate \( x = -4i \) must also be a zero.
2. Formulate the polynomial by combining these zeros into factors of the polynomial and multiplying them out.
Transcribed Image Text:### Polynomial Simplification and Zero-Finding #### Exercise 1: Simplify by Multiplying \[ (x + 6i)(x - 6i) \] In this problem, we need to simplify the expression by multiplying the two binomials. #### Exercise 2: Finding a Polynomial with a Given Zero \[ \text{Find a polynomial with zero } x = 4i. \] In this problem, we need to find a polynomial such that \( x = 4i \) is one of its zeros. Note: In the second exercise, some text is unreadable due to a scribble, but the instruction is clear about finding a polynomial with a specified zero. ### Steps for Exercise 1: 1. Distribute the terms in the binomials. 2. Apply the difference of squares formula where applicable. 3. Simplify the resulting expression. ### Steps for Exercise 2: 1. Use the fact that for a polynomial to have a non-real zero \( x = 4i \), the conjugate \( x = -4i \) must also be a zero. 2. Formulate the polynomial by combining these zeros into factors of the polynomial and multiplying them out.
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