Solve the following equation:
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Solve the following equation:
To solve the equation , follow these steps:
Carrying out these steps:
Step 2: The common denominator is . Rewrite the equation as:
.
Step 3: Combine the fractions:
.
Step 3: Simplifying gives:
.
Step 3: Cross-multiply to eliminate the fraction:
.
Step 4: Expand the right-hand side:
.
Step 4: Rearrange to form a quadratic equation:
.
Step 5: Use the quadratic formula . Here, , , :
.
Step 5: Simplify:
.
This results in two potential solutions for :
and .
Therefore, the solution to the problem is , which matches the correct answer choice.
Determine if the simplification shown below is correct:
\( \frac{7}{7\cdot8}=8 \)
Substitution with transforms this into a simple quadratic equation! This avoids messy algebra and makes the pattern much clearer to see.
If , then and we'd be dividing by zero, which is undefined. So is not allowed in the domain.
Look for repeated expressions! Since we have both and , setting makes the second term become .
The quadratic formula gives us . When we solve , we get , leading to the form .
Always substitute back! It's the only way to catch errors and verify that your solutions don't create undefined expressions (like division by zero).
In this problem, the discriminant is , so we get real solutions. If you got a negative discriminant, double-check your algebra!
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