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Chapter 5: Q. 81 (page 284)

If 4x=7, what does 4-2xequal?

Short Answer

Expert verified

The value of4-2xis149.

Step by step solution

01

Step 1. Given Information

Given :

4x=7

We have to find4-2x

02

Step 2. Write expression to be found in terms of given expression.

4-2x=(4x)-2

03

Step 3. Put the given value in the expression and solve.

(4x)-2=(7)-2=172=149

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Most popular questions from this chapter

Vehicle Stopping Distance Taking into account reaction time, the distance d(in feet) that a car requires to come to a complete stop while traveling rmiles per hour is given by the function

localid="1646198784356" d(r)=6.97r-90.39

a. Express the speed rat which the car is traveling as a function of the distance localid="1646198792401" drequired to come to a complete stop

b. Verify that localid="1646198797631" r=r(d)is the inverse of localid="1646198802104" d=d(r)by showing that localid="1646198806352" r(d(r))=rand localid="1646198811055" d(r(d))=d

c. Predict the speed that a car was traveling if the distance required to stop was localid="1646198818232" 300feet.

d(r(d))=d

The function f(x)=|x|is not one-to-one. Find a suitable restriction on the domain of f so that the new function that results is one-to-one. Then find the inverse of f.

Answers are given at the end of these exercises. If you get a wrong answer, read the pages listed in red.

For an exponential function, f(x)=Cax,f(x+1)f(x)=

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