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2)

3) r² = 100

r = +10, -10

4) x² = 144

x = + 12, -12

5) 2s²/2 = 50/2

s² = 25

s = + 5, -5

1. x² = 16

√x² = √16

x = 4

2. t² = 81

√t² = √81

t = 9

3. r² -100 = 0

r² = 100

√r² = √100

r = 10

r = 10

4. x² -144 = 0

x² = 144

√x² = √144

x = 12

x = 12

5. 2s² = 50

=

√s² = √25

s = 5

s=5