Algebra Review (Simplify, Solve Equations, Square Roots)

2x = -8

• x = -4
• x = 4
• x = -10
• x = 6

-48 = -6a

• a = -8
• a = 8
• a = 42
• a = -42

-3(4x - 10) = 42

• x = 0
• x = 1
• x = -1
• no solution

12 = 2c - 4

• c = 8
• c = -8
• c = 4
• c = -4

d + 5 = 10

• d = -5
• d = 5
• d = 0
• no solution

Solve for x:
8x - 10 = -34

• 4
• 3
• -3
• -24

Find the error in the problem below
19 - 2k = 3k - 1
     +3k   +3k
19 + 1k = -1
-19           -19
k = -20

• They should have divided by 1 for the last step
• They should add 19 instead of subtracting 19
• I can not find an error
• Instead of adding 3k they should subtract 3k

The steps in solving 5b - 6 = 24 are: 

• Add 6 to both sides and divide both sides by 5
• Add 6 to both sides and multiply both sides by 5
• Subtract 6 from both sides then multiply both sides by 5
• Subtract 6 from both sides then divide both sides by 5

What is the first step to solve this equation:
-11 - 3x = 44

• Add 3 to both sides
• Subtract 11 from both sides
• Add 11 to both sides
• Divide 3 on both sides.

Solve for x.

• x = 21
• x = 7
• x = −21
• x = 4