Page 728 - Algebra 1

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√ _ 1 4 0
2 -6 8
√ 7 0 - 6 8 √ 6 4 8 8 = 8
C h e c k √ 4 x = 1 2
√4(36) 12 √ 1 4 4 1 2
12=12 ✓
c. √ x+ 2=12 SOLUTION
Use inverse operations.
√ x + 2 = 1 2 (√x + 2)2 = 122
x + 2 = 144 _-_2 = -__2
x = 142
Check √x + 2=12 √1 42 + 2 12 √ 1 4 4 1 2
Square both sides.
Simplify.
Subtraction Property of Equality Simplify.
12=12 ✓ _ x
d. √-6=8 2
SOLUTION
Square both sides.
Simplify.
Addition Property of Equality Simplify.
Multiplication Property of Equality Simplify.
✓
Use inverse operations. _ x
√ -6=8 2
_x 2 2 (√ -6)=8
2
2
_x - 6 = 6 4 +_ _6 +_ _6
_x = 7 0 2
2 · _x = 7 0 · 2 2
x = 140 _ x
Check √ -6=8 2
Lesson 106 713