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2. Can every expression be factored? Build and sketch each expression below as a rectangle if possible. Then write an equation showing that the area is equal to the product of its side length factors. Check by multiplying the factors to get the original expression. If the expression cannot be built as a rectangular area, explain why no rectangle exists and thus why the expression cannot be factored.

a. [tex]2x^2 + 7x + 6[/tex]


Sagot :

Let's tackle the problem of factoring the quadratic expression [tex]\(2x^2 + 7x + 6\)[/tex]. To factorize this, we need to express it as a product of two binomials.

### Step-by-Step Solution:

1. Identify the quadratic expression:
We start with the quadratic expression [tex]\(2x^2 + 7x + 6\)[/tex].

2. Factor the expression:
We want to factor the quadratic expression [tex]\(2x^2 + 7x + 6\)[/tex] into the form [tex]\((ax + b)(cx + d)\)[/tex].

Through factoring, we find that:
[tex]\[ 2x^2 + 7x + 6 = (x + 2)(2x + 3) \][/tex]

3. Equation of Area Representation:
To represent this algebraically, we express that the area of the rectangle formed by sides [tex]\((x + 2)\)[/tex] and [tex]\((2x + 3)\)[/tex] is equivalent to the original quadratic expression.

Therefore:
[tex]\[ \text{Area} = \text{Length} \times \text{Width} \][/tex]
[tex]\[ 2x^2 + 7x + 6 = (x + 2)(2x + 3) \][/tex]

4. Verify by Multiplying the Factors to get the Original Expression:
Let's expand the factors to ensure we get back the original expression:
[tex]\[ (x + 2)(2x + 3) = x \cdot 2x + x \cdot 3 + 2 \cdot 2x + 2 \cdot 3 \][/tex]
[tex]\[ = 2x^2 + 3x + 4x + 6 \][/tex]
[tex]\[ = 2x^2 + 7x + 6 \][/tex]

Thus, the factors multiply to give us the original quadratic expression, confirming that our factorization is correct.

### Rectangular Sketch:
To visualize it, you can imagine the rectangle with sides [tex]\(x + 2\)[/tex] and [tex]\(2x + 3\)[/tex]:

- The length of the rectangle is [tex]\(x + 2\)[/tex].
- The width of the rectangle is [tex]\(2x + 3\)[/tex].

### Conclusion:
We have successfully factored the quadratic expression [tex]\(2x^2 + 7x + 6\)[/tex] into [tex]\((x + 2)(2x + 3)\)[/tex]. This means it can be represented as a rectangular area where one side is [tex]\(x + 2\)[/tex] and the other side is [tex]\(2x + 3\)[/tex]. The area of this rectangle matches the original quadratic expression when multiplied out, confirming the factorization.

Thus, [tex]\(2x^2 + 7x + 6\)[/tex] can indeed be factored, and the area equivalently represents the product of its side length factors.