Find the Missing Term in (3x-8)(-4+?) = -3x²-4x+32

Complete the missing element

(3x8)(4+?)=3x24x+32 (3x-8)(-4+?)=-3x^2-4x+32

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Complete the missing term
00:03 Substitute Y as unknown
00:08 Open parentheses properly, multiply each factor by each factor
00:29 Calculate the products
00:44 Reduce what's possible and collect terms
01:09 Factor out common terms from each side
01:18 Isolate the unknown Y
01:24 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Complete the missing element

(3x8)(4+?)=3x24x+32 (3x-8)(-4+?)=-3x^2-4x+32

2

Step-by-step solution

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

  • Step 1: Expand the binomial expression using the distributive property.
  • Step 2: Compare the resulting polynomial's coefficients with the given expression's coefficients.
  • Step 3: Solve for the missing element.

Now, let's work through each step:
Step 1: Express (3x8)(4+?)(3x-8)(-4+?) using the distributive property:
(3x)(4)+(3x)(?)(8)(4)(8)(?)(3x)(-4) + (3x)(?) - (8)(-4) - (8)(?).
This simplifies to: 12x+3x(?)+328(?)-12x + 3x(?) + 32 - 8(?).

Step 2: Compare with 3x24x+32-3x^2 - 4x + 32, equaling terms by degree:
- The constant term (32) already matches.
- The xx term is 12x+3x(?)=4x-12x + 3x(?) = -4x.
- The x2x^2 term arises from 3x(?)3x(?).

Step 3: Solve for the missing element by aligning coefficients:
3x(?)=3x23x(?) = -3x^2, therefore ?=x? = -x.
Thus, the missing element is x-x.

Therefore, the solution to the problem is x-x, which corresponds to choice 2.

3

Final Answer

x -x

Practice Quiz

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\( (3+20)\times(12+4)= \)

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