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BaLLatris [955]
3 years ago
14

Which shows 42^2 − 38^2 being evaluated using the difference of perfect squares method?

Mathematics
1 answer:
DochEvi [55]3 years ago
8 0

Answer:

320

Step-by-step explanation:

42^2-38^2= (42+38)(42-38)

=80*4

=320

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Solve the equation for exact solutions over the interval​ [0, 2π​).
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Answer:

\displaystyle x=\left\{0, \frac{2\pi}{3}, \frac{4\pi}{3}\right\}

Step-by-step explanation:

We want to solve the equation:

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First, notice that this is in quadratic form. So, to make things simpler, we can let <em>u</em> = cos(x). Substitute:

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2u^2-u-1=0

Factor:

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Zero Product Property:

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