Q. What is the period of the functiong(x)=−9cos(−2πx−6)+8?Give an exact value.units
Identify b value: The period of a cosine function of the form cos(bx) is ∣b∣2π. In the given function g(x)=−9cos(−(2π)x−6)+8, we need to identify the value of b to determine the period.
Rewrite function: The function g(x) can be rewritten without the negative inside the cosine as g(x)=−9cos(2πx+6)+8, because cos(−θ)=cos(θ). This does not change the period of the function.
Calculate period: Now, we can see that the coefficient b in front of x inside the cosine function is π/2. Therefore, the period of g(x) is 2π divided by ∣π/2∣.
Period calculation: Calculating the period, we have Period = ∣π/2∣2π=(π/2)2π=(2π)⋅(π2)=4.
Final period: The period of the function g(x)=−9cos(2πx+6)+8 is 4 units.
More problems from Domain and range of quadratic functions: equations