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kumpel [21]
3 years ago
13

Gabrielle's age is two times Mikhail's age. The sum of their ages is 21 . What is Mikhail's age?

Mathematics
2 answers:
kirza4 [7]3 years ago
7 0

Answer:

Gabrielle is 14 and Mikhali is 7

Lynna [10]3 years ago
7 0

Answer:

let the age be x and 2x

2x+x=21

3X=21

X=7

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Answer:

x = \frac{7}{2} ± \frac{\sqrt{13} }{2}

Step-by-step explanation:

Given

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Solve using the method of completing the square

add ( half the coefficient of the x- term)² to both sides

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x - \frac{7}{2} = ± \sqrt{\frac{13}{4} } = ± \frac{\sqrt{13} }{2} ( add

x = \frac{7}{2} ± \frac{\sqrt{13} }{2} = \frac{7+/-\sqrt{13} }{2}

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