68 Easy Algebra Step-by-Step

c.^6

71

() 1

x

Step 1. Substitute 4 for x in the expression

6

71 x

()x^1.

6

71

6

x 741

()x 1

=

() 4 + 1

+

Step 2. Simplify the resulting expression.

=

()

+

6 (

72 ⋅ 1

=

+

30

14 1

=

30

15

= 2

Step 3. State the main result.

6

71

2

x

()x 1

= when x= 4.

d. −

+

15 +

1

yx+ 5 y

z

()x−y

Step 1. Substitute 4 for x, − 8 for y, and − 5 for z in the expression

− ()−

+

15 +

1

y+ (^5) (
z

.

− ()−

+

=

− + ()−()−

()−

15 +

1

18 − (^5) (
)+ 1
y+ (^5) (
z
Step 2. Simplify the resulting expression.

− ()+ ()+

−

1 ( 5 (

51 +

=

− ()

−

85 +

4

=

−

−

86 + 0

4

74 +≠ 171 5. The square root applies

only to the 4.