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OpenStudy (anonymous):
solve for x if -2 < x < 1 for 7cos4(x+5) = -2
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OpenStudy (anonymous):
7cos(4*(x+5))=-2
OpenStudy (anonymous):
divide both sides by 7
OpenStudy (anonymous):
cos(4*(x+5))=-2/7 take cos inverse 4*(x+5)=acos(-2/7)
OpenStudy (anonymous):
divide by 4 both sides x+5=acos(-2/7)/4 add negative 5 for both sides x=acos(-2/7)/4-5
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