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

Question

Complete the missing element

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

Video Solution

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.

Answer

x -x