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Mathematics

1 answer:

borishaifa [10]2 years ago

5 0

Answer:

See below ↓

Step-by-step explanation:

Problem

$\frac{5x}{x+7} + \frac{7}{x}$

Work

$\frac{5x(x)+7(x+7)}{x(x+7)}$
$\frac{5x^{2} +7x+49}{x(x+7)}$
The student's mistake was that instead of taking x(x + 7) as the LCM (Least Common Multiple), he took x + 7, which is not possible in this case

Solution

$\frac{5x^{2} +7x+49}{x(x+7)}$

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