How do you solve $15=17+4cos(x/7)$ ?

1 Answer

Aug 5, 2016

$x=840$

Explanation:

$15=17+4cos(x/7)$
or
$4cos(x/7)=15-17$
or
$4cos(x/7)=-2$
or
$cos(x/7)=-2/4$
or
$cos(x/7)=-1/2$
or
$cos(x/7)=cos120$
or
$x/7=120$
or
$x=7(120)$
or
$x=840$

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How do you solve $15=17+4cos(x/7)$ ?

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