Exercise 44 Page 337

Practice makes perfect

We want to evaluate the given expression using x= - 2, y= - 5, and z= 3. Let's substitute these values into the expression and simplify as much as possible.

xyz

SubstituteValues

Substitute values

- 2( - 5)( 3)

MultNegNegOnePar

- a(- b)=a* b

10(3)

Multiply

The expression is equal to 30 when x= - 2, y= - 5, and z= 3.

We want to evaluate the given expression using x= - 2, y= - 5, and z= 3. In this case, let's substitute - 2 for x and - 5 for y in the expression and simplify as much as possible.

3(x+y)

SubstituteII

x= - 2, y= - 5

3( - 2+( - 5))

AddNeg

a+(- b)=a-b

3(- 2-5)

SubTerm

Subtract term

3(- 7)

MultPosNeg

a(- b)=- a * b

- 3(7)

Multiply

- 21

The expression is equal to - 21 when x= - 2 and y= - 5.

We want to evaluate the given expression for x= - 2, y= - 5, and z= 3. We can do so by substituting - 5 for y and 3 for z in the expression and simplifying as much as possible.

z+2/y+1

SubstituteII

z= 3, y= - 5

3+2/- 5+1

AddTerms

Add terms

5/- 5+1

MoveNegDenomToFrac

Put minus sign in front of fraction

- 5/5+1

QuotOne

a/a=1