Step-by-step explanation:
I think, he made a mistake because the exponents have different values but then if you'll look at his results, he just wrote the same thing. If you want, you could post the original problem, and I'll solve it for you :)
You are going to add a 15% tip to your bill. If the meal cost you $13.80, what is your tip amount? *
2 answers:
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Complete the square:
And we have:
Answer B.