Find the Coefficients in y=5x-3x²: Polynomial Term Analysis

Quadratic Coefficients with Standard Form

Identify the coefficients based on the following equation

y=5x3x2 y=5x-3x^2

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:05 First, let's find the function coefficients.
00:08 We will use the formula for representing a quadratic equation.
00:16 Now, arrange the equation so it matches our formula.
00:40 Be sure to separate the variable from its coefficient.
00:53 Compare this formula to our equation, and identify the coefficients.
01:02 And that's how we solve this problem!

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=5x3x2 y=5x-3x^2

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Express the given quadratic function y=5x3x2 y = 5x - 3x^2 in the standard form.
  • Step 2: Compare the given function with the standard form y=ax2+bx+c y = ax^2 + bx + c .
  • Step 3: Match the coefficients to find the values of a a , b b , and c c .

Now, let's work through each step:

Step 1: The given function is y=5x3x2 y = 5x - 3x^2 .

Step 2: We need the function in the form y=ax2+bx+c y = ax^2 + bx + c . Reordering terms gives us y=3x2+5x y = -3x^2 + 5x .

Step 3: Comparing y=3x2+5x y = -3x^2 + 5x to y=ax2+bx+c y = ax^2 + bx + c , we identify:

  • The coefficient of x2 x^2 is a=3 a = -3 .
  • The coefficient of x x is b=5 b = 5 .
  • The constant term (often written last) is c=0 c = 0 since no constant term is present.

Therefore, the solution to this problem is the coefficients identified as a=3 a = -3 , b=5 b = 5 , and c=0 c = 0 .

3

Final Answer

a=3,b=5,c=0 a=-3,b=5,c=0

Key Points to Remember

Essential concepts to master this topic
  • Standard Form: Always arrange as ax2+bx+c ax^2 + bx + c
  • Technique: Rewrite 5x3x2 5x - 3x^2 as 3x2+5x+0 -3x^2 + 5x + 0
  • Check: Verify a=3 a = -3 , b=5 b = 5 , c=0 c = 0 match term positions ✓

Common Mistakes

Avoid these frequent errors
  • Confusing coefficient signs and order
    Don't read coefficients in the order they appear = wrong values! The equation 5x3x2 5x - 3x^2 looks like a=5, b=-3, but that ignores standard form. Always rearrange to ax2+bx+c ax^2 + bx + c first, then identify coefficients.

Practice Quiz

Test your knowledge with interactive questions

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

\( 3x^2+8x-5 \)

FAQ

Everything you need to know about this question

Why do I need to rearrange the terms first?

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The standard form ax2+bx+c ax^2 + bx + c has a specific order! Without rearranging, you might assign coefficients to the wrong variables. Always put the highest power term first.

What if there's no constant term like in this problem?

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When there's no constant term, c = 0. Don't forget to include it! The equation y=3x2+5x y = -3x^2 + 5x is really y=3x2+5x+0 y = -3x^2 + 5x + 0 .

How do I remember which coefficient is which?

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Think alphabetically: a goes with x2 x^2 (highest power), b goes with x1 x^1 , and c is the constant (no x).

What if the coefficient is negative?

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Keep the negative sign! In 3x2 -3x^2 , the coefficient is a = -3, not just 3. The sign is part of the coefficient.

Can I identify coefficients without rearranging?

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It's risky! You might get confused about which coefficient goes where. Always rearrange to standard form ax2+bx+c ax^2 + bx + c first - it only takes a few seconds and prevents mistakes.

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