Identify Coefficients in y=6x+3x²-4: Polynomial Term Analysis

Polynomial Standard Form with Coefficient Identification

Identify the coefficients based on the following equation

y=6x+3x24 y=6x+3x^2-4

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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 Use the formula to represent a quadratic equation
00:14 Arrange the equation to match the formula
00:45 Separate the unknown from the coefficient
01:03 Compare the formula to our equation and find the coefficients
01:16 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=6x+3x24 y=6x+3x^2-4

2

Step-by-step solution

To solve this problem, we'll proceed with the following steps:

  • Step 1: Rewrite the given quadratic function y=6x+3x24 y = 6x + 3x^2 - 4 .
  • Step 2: Compare the equation to the standard form of a quadratic equation y=ax2+bx+c y = ax^2 + bx + c .
  • Step 3: Identify and assign the values of coefficients a a , b b , and c c .

Now, let's execute these steps:

Step 1: The given function is already y=6x+3x24 y = 6x + 3x^2 - 4 .

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

Step 3: Upon comparison, we can observe:

  • The coefficient of x2 x^2 is 3, so a=3 a = 3 .
  • The coefficient of x x is 6, so b=6 b = 6 .
  • The constant term is 4-4, so c=4 c = -4 .

Therefore, the solution is a=3,b=6,c=4 a=3, b=6, c=-4 . This corresponds to choice 1.

3

Final Answer

a=3,b=6,c=4 a=3,b=6,c=-4

Key Points to Remember

Essential concepts to master this topic
  • Standard Form: Quadratic functions follow y=ax2+bx+c y = ax^2 + bx + c pattern
  • Technique: Rearrange y=6x+3x24 y = 6x + 3x^2 - 4 to y=3x2+6x4 y = 3x^2 + 6x - 4
  • Check: Match powers: x2 x^2 term = 3, x x term = 6, constant = -4 ✓

Common Mistakes

Avoid these frequent errors
  • Matching coefficients without reordering to standard form
    Don't read coefficients directly from y=6x+3x24 y = 6x + 3x^2 - 4 in given order = wrong assignments! This leads to thinking a = 6 instead of a = 3. Always rewrite in standard form ax2+bx+c ax^2 + bx + c first.

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 rewrite the equation in standard form first?

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Standard form y=ax2+bx+c y = ax^2 + bx + c puts terms in decreasing power order. This ensures you match the right coefficient to the right variable power every time!

What if there's no x² term in the equation?

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If there's no x2 x^2 term, then a = 0 and it's actually a linear equation, not quadratic. Always check the highest power to determine the equation type.

How do I remember which coefficient is which?

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Remember: a = coefficient of x2 x^2 (highest power), b = coefficient of x x (middle power), c = constant term (no variable).

What if a coefficient is negative?

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Keep the negative sign! In y=3x2+6x4 y = 3x^2 + 6x - 4 , the constant term is -4, not just 4. Signs are part of the coefficient value.

Can I identify coefficients if terms are mixed up?

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Yes! Just reorder the terms by decreasing powers first: x2 x^2 term, then x x term, then constant. Then match coefficients to standard form.

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