The principal square root 4 and its negative -4
2(4z-9-11)=166-46
8z-18-22=120
8z-40=120
Add 40 from both side
8z-40+40=120+40
8z=160
Divided 8 from both side
8z/8=160/8
z=20. Hope it help!
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Answer:
b = √c²-a²
Step-by-step explanation:
b² = c² - a²
b = √c²-a²
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