Craft an Algebraic Expression with Constants a=-1, b=-8, c=0

Quadratic Expressions with Given Coefficients

Create an algebraic expression based on the following parameters:


a=1,b=8,c=0 a=-1,b=-8,c=0

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Convert the parameters to a quadratic function
00:03 We'll use the formula to represent a quadratic equation
00:08 We'll connect the parameter to its corresponding unknown according to the formula
00:24 We'll write the function in its reduced form
00:29 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

Create an algebraic expression based on the following parameters:


a=1,b=8,c=0 a=-1,b=-8,c=0

2

Step-by-step solution

To solve this problem, we'll start by substituting the given parameters into the standard quadratic formula:

y=ax2+bx+c y = ax^2 + bx + c

The problem gives us the values:

  • a=1 a = -1
  • b=8 b = -8
  • c=0 c = 0

This means we need to replace a a , b b , and c c in the formula:

y=(1)x2+(8)x+0 y = (-1)x^2 + (-8)x + 0

Simplifying this expression further:

  • The term with a a : (-1)x^2\) results in x2 -x^2 .
  • The term with b b : (-8)x\) simplifies to 8x -8x .
  • The term with c c : 0 0 contributes nothing to the expression, so it is omitted.

Thus, the final algebraic expression is:

y=x28x y = -x^2 - 8x

Therefore, the algebraic expression based on the given parameters is

x28x -x^2 - 8x .

3

Final Answer

x28x -x^2-8x

Key Points to Remember

Essential concepts to master this topic
  • Standard Form: Use ax² + bx + c with given coefficient values
  • Substitution: Replace a = -1, b = -8, c = 0 to get -x² - 8x
  • Verification: Check that coefficients match: a = -1, b = -8, c = 0 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting negative signs when substituting coefficients
    Don't write (-1)x² as x² or (-8)x as 8x = wrong expression! This changes the entire meaning and gives the opposite result. Always keep the negative signs when a = -1 and b = -8.

Practice Quiz

Test your knowledge with interactive questions

Identify the coefficients based on the following equation

\( y=x^2 \)

FAQ

Everything you need to know about this question

Why do I drop the c term when c = 0?

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When c=0 c = 0 , adding zero doesn't change the expression. So -x² - 8x + 0 simplifies to just -x² - 8x. It's cleaner to omit terms that equal zero!

Do I need to include y = in my final answer?

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The question asks for an algebraic expression, not an equation. So just write -x² - 8x without the 'y =' part. Think of it as the formula part only!

What if a was positive instead of -1?

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If a=1 a = 1 instead, your first term would be +x² rather than -x². The coefficient of x² always matches the value of 'a' exactly.

How do I remember the standard quadratic form?

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Remember ax² + bx + c goes from highest power to lowest:

  • x² term (quadratic)
  • x term (linear)
  • constant term
Just like counting down: 2, 1, 0!

What does it mean when b is negative?

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When b=8 b = -8 , the middle term becomes -8x. The negative sign is part of the coefficient, so you're subtracting 8x from the x² term.

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