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Use the given length and area of a rectangle to express the width algebraically. (Simplify your answer completely.)Length is 3x − 4Area is 6x^4 − 8x^3 + 9x^2 − 3x − 12

Sagot :

Given the expression that represents the length of the rectangle:

[tex]3x-4[/tex]

And the expression that represents the area of the rectangle:

[tex]6x^4-8x^3+9x^2-3x-12[/tex]

You need to remember that the formula for calculating the area of a rectangle is:

[tex]A=lw[/tex]

Where "l" is the length and "w" is the width.

If you solve for the width, you get this formula:

[tex]w=\frac{A}{l}[/tex]

Therefore, you can write this expression to represent the width of the given rectangle:

[tex]\frac{6x^4-8x^3+9x^2-3x-12}{3x-4}[/tex]

In order to simplify it, you can follow these steps:

1. Rewrite this term in this form in the numerator:

[tex]3x=-12x+9x[/tex]

Then:

[tex]=\frac{6x^4-8x^3+9x^2-12x+9x-12}{3x-4}[/tex]

2. Group pair of terms in the numerator and factor the Greatest Common Factor (the largest factor each group has in common) out of the parentheses:

[tex]=\frac{(6x^4-8x^3)+(9x^2-12x)+(9x-12)}{3x-4}[/tex][tex]=\frac{2x^3(3x-4)+3x(3x-4)+3(3x-4)}{3x-4}[/tex]

3. Factor this Greatest Common Factor out in the numerator:

[tex]3x-4[/tex]

You get:

[tex]=\frac{(3x-4)(2x^3+3x+3)}{3x-4}[/tex]

4. By definition:

[tex]\frac{a}{a}=1[/tex]

Therefore, you get:

[tex]=2x^3+3x+3[/tex]

Hence, the answer is:

[tex]2x^3+3x+3[/tex]