Exercise 5 Page 326

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.

w(5)

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

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

Substitute

x= 5

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

CalcPow

Calculate power

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

Multiply

Multiply

w(5)=- 250+15-12

Calculate

w(5)=- 247

w(- 4)

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

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

Substitute

x= - 4

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

CalcPow

Calculate power

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

MultNegNegTwoPar

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

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

MultPosNeg

a(- b)=- a * b

w(- 4)=128-12-12

Calculate

w(- 4)=104