Find Coefficients in y = 4x + 4x²: Term-by-Term Analysis

Quadratic Coefficients with Standard Form

Identify the coefficients based on the following equation

y=4x+4x2 y=4x+4x^2

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the function coefficients
00:03 We'll use the formula to represent a quadratic equation
00:12 We'll arrange the equation to match the formula
00:35 We'll separate the variable from the coefficient
00:44 We'll compare the formula to our equation and find the coefficients
00:55 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Identify the coefficients based on the following equation

y=4x+4x2 y=4x+4x^2

2

Step-by-step solution

To solve this problem, let's follow these steps:

  • Step 1: Understand the given function.
  • Step 2: Compare it with the standard quadratic form.
  • Step 3: Identify the coefficients a a , b b , and c c .

Now, let's work through each step:

Step 1: We are given the function y=4x+4x2 y = 4x + 4x^2 , which is written in terms of x x .

Step 2: The standard form for a quadratic function is y=ax2+bx+c y = ax^2 + bx + c .

Step 3: We need to rearrange the given function and align it with the standard form for easy comparison:
y=4x2+4x+0 y = 4x^2 + 4x + 0 .

By comparing with y=ax2+bx+c y = ax^2 + bx + c , we can directly match the coefficients:
- The coefficient a a for x2 x^2 is 4 4 .
- The coefficient b b for x x is 4 4 .
- The constant term c c is 0 0 .

Therefore, the parameters are a=4,b=4,c=0 a = 4, b = 4, c = 0 .

3

Final Answer

a=4,b=4,c=0 a=4,b=4,c=0

Key Points to Remember

Essential concepts to master this topic
  • Standard Form: Write quadratic as ax2+bx+c ax^2 + bx + c
  • Rearrangement: 4x+4x2 4x + 4x^2 becomes 4x2+4x+0 4x^2 + 4x + 0
  • Verification: Match each term's coefficient: a=4,b=4,c=0 a = 4, b = 4, c = 0

Common Mistakes

Avoid these frequent errors
  • Confusing coefficient order
    Don't match coefficients in the order they appear = wrong identification! The standard form is always ax2+bx+c ax^2 + bx + c , so you must rearrange first. Always rewrite in descending powers before matching coefficients.

Practice Quiz

Test your knowledge with interactive questions

What is the value of the coefficient \( c \) in the equation below?

\( 4x^2+9x-2 \)

FAQ

Everything you need to know about this question

Why do I need to rearrange the terms before identifying coefficients?

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The standard form ax2+bx+c ax^2 + bx + c follows a specific order: highest power first. Rearranging helps you clearly match each coefficient to its correct variable.

What if there's no constant term in the equation?

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When there's no constant term visible, like in y=4x+4x2 y = 4x + 4x^2 , the constant c = 0. Always include this zero when writing in standard form!

How do I remember which coefficient is which?

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Use the mnemonic "ABC": A goes with x2 x^2 , B goes with x x , and C is the constant (no variable).

Can the coefficient 'a' ever be zero?

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If a=0 a = 0 , then you don't have an x2 x^2 term, making it a linear equation, not quadratic. For quadratic functions, a0 a ≠ 0 .

What's the difference between coefficients and variables?

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Coefficients are the numbers multiplying the variables (like 4 in 4x2 4x^2 ). Variables are the letters that can change value (like x).

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