The question is:
$\endgroup$ 4Rectangular floor mats have an area of $x^2 + 2x - 15 \text{ cm}^2$. The length is $x + 5\text{ cm}$, and the width is $100\text{ cm}$. How do I find out the value of $x$, and from there the length of the mat? The equation to find the width is $$\frac{x^2+2x-15}{\text{length}}$$
1 Answer
$\begingroup$Hint. One may solve, for $x>0$, $$ \frac{x^2+2x-15}{x+5}=100 $$ or $$ \frac{(x+5)(x-3)}{x+5}=100 $$
Can you take it from here?
$\endgroup$ 2
