Answer:
a^-7
Step-by-step explanation:
we need to know that :
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so the ans is

by the way

Answer: 2:4
Step-by-step explanation:
Both are correct nice job
Answer:
- Lin has provided the correct answer.
Step-by-step explanation:
The equation has two roots as a quadratic equation.
Elena's solution ends up with loss of one of the roots when cancelling the variable.
Lin gets two roots, so she is correct.