Question

Subtract and simplify​

Answer 1

Answer:

D

Step-by-step explanation:

Since the denominators of both fractions are common, then subtract the numerators leaving the common denominator, that is

$\frac{4a+1-2a-7}{a^2-4}$ = $\frac{2a-6}{a^2-4}$

Answer 2

Answer:

$\boxed{\bold{\frac{2a-6}{a^2-4}}}$

Explanation:

Apply Rule $\bold{\frac{a}{c}\pm \frac{b}{c}=\frac{a\pm \:b}{c}}$

= $\bold{\frac{4a+1-\left(2a+7\right)}{a^2-4}}$

Expand $\bold{4a+1-\left(2a+7\right): \ 2a-6}$

= $\bold{\frac{2a-6}{a^2-4}}$

Mordancy.