Exercise 5 Page 326

First calculate the function's value when x=5 and then x=- 4

w(5)=- 247; w(- 4)=104

Practice makes perfect

Using the function w(x), we want to evaluate for the given values, w( 5) and w( -4). Let's consider these one at a time.

To do this, we need to substitute 5 for x in each instance of the x-variable.

w(x)=- 2x^3+3x-12

x= 5

w(5)=- 2( 5)^3+3( 5)-12

Calculate power

w(5)=- 2 (125)+3(5)-12

w(5)=- 250+15-12

Calculate $$

w(5)=- 247

To do this, we need to substitute - 4 for x in each instance of the x-variable.

w(x)=- 2x^3+3x-12

x= - 4

w(- 4)=- 2( - 4)^3+3( - 4)-12

Calculate power

w(- 4)=(- 2) (- 64) +3 (- 4)-12

(- a)(- b)=a* b

w(- 4)=128 +3 (- 4)-12

a(- b)=- a * b

w(- 4)=128-12-12

Calculate $$

w(- 4)=104

Check Your Understanding p.326

Practice and Problem Solving p.326-328

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Standardized Test Practice p.329

Spiral Review p.329

Skills Review p.329

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