Complete the missing element
(3x−8)(−4+?)=−3x2−4x+32
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 (3x−8)(−4+?) using the distributive property:
(3x)(−4)+(3x)(?)−(8)(−4)−(8)(?).
This simplifies to: −12x+3x(?)+32−8(?).
Step 2: Compare with −3x2−4x+32, equaling terms by degree:
- The constant term (32) already matches.
- The x term is −12x+3x(?)=−4x.
- The x2 term arises from 3x(?).
Step 3: Solve for the missing element by aligning coefficients:
3x(?)=−3x2, therefore ?=−x.
Thus, the missing element is −x.
Therefore, the solution to the problem is −x, which corresponds to choice 2.