Easy Algebra Step-by-Step

20 Easy Algebra Step-by-Step

e.^2

9

7

9

+−

Step 1. Determine which addition rule applies.

2

9

7

9

+−

The signs are opposites (one positive and one negative), so use Rule 2.

Step 2. Subtract

2

9

from

7

9

because −>

7

9

2

9

.

7

9

2

9

5

9

−=

Step 3. Make the sum negative because −

7

9

has the greater absolute value.

2

9

7

9

5

9

+− =−

f. − 975858 ++−. 12

Step 1. Determine which addition rule applies.

− 97 .. 75858 ++− 12

The signs are the same (both negative), so use Rule 1.

Step 2. Add the absolute values 9.75 and 8.12.

97 .. 7585888. 1212 = 17. 87

Step 3. Give the sum a negative sign (the common sign).

− 97 .. 75858 ++− 12 =− 17. 87

g. −+ 99036 0

Step 1. Determine which addition rule applies.

−+ 990. 36 0

0 is added to a number, so the sum is the number (Rule 3).

−+ 990 .. 3636 + 00 =− 99099036