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Reduce rational expressions to lowest terms: Error analysis


Raiden tried to reduce the following expression to lowest terms:
This is his work:
Factoring the numerator: 4x212x=4x(x3)
Factoring the denominator: 3x2+15x=3x(x+5)
Reducing to lowest terms:
Finding excluded values: x5
What mistake did Raiden make?
Choose 1 answer: