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valentinak56 [21]

3 years ago

8

Meggy was solving the following equation: 3x + 5 = 64 She concluded that the value of x is

D19.6666..." id="TexFormula1" title="x=19.6666..." alt="x=19.6666..." align="absmiddle" class="latex-formula"> Is she correct?

1 answer:

Lelu [443]3 years ago

5 0

Answer:

Yes, she is correct.

Step-by-step explanation:

$3x+5=64\\\\3x+5-5=64-5\\\\3x=59\\\\\frac{3x}{3}=\frac{59}{3}\\\\ \frac{59}{3}=19\frac{2}{3}\\\\19\frac{2}{3}=19.666...\\\\ \text{Therefore}:\\x=\boxed{19.666...}$

The digit of 6 is repeating.

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garik1379 [7]

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maybe they want us to use pythagorean identity

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I notice we have 1-cos(x) and 1+cos(x), if we multiply them, we get $1-cos^2(x)$

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subsituting

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