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91Ó°ÊÓ

Examples 4 and 5 Iff(x)=−2x−3 andg(x)=x2+5x, find each value. (P. 50)

f(4y)

Short Answer

Expert verified

The function value atx=4y is −8y−3.

Step by step solution

01

Step 1. Interpreting of function.

f4yIndicates the value of functionfx atx=4y

02

Step 2. Apply substitution method.

Substitutex=4y into the functionfx

width="131">f4y=−24y−3

03

Step 3. Further calculation:

f4y=−24y−3f4y=−8y−3

Thus, the function value atx=4y is−8y−3

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