a. {-3,3}
b. {-3}
c. {3}
d. Ø
t - √(6t - 9) = 0 ? parenthesis are your friend
Subtract t from both sides:
-√(6t - 9) = -t
Square both sides:
-√(6t - 9)² = -t²
-(6t - 9) = -t²
Add t² to both sides:
t² - 6t + 9 = 0
(t - 3)(t - 3) = 0
t = 3
Answer is C
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Verified answer
t - √(6t - 9) = 0 ? parenthesis are your friend
Subtract t from both sides:
-√(6t - 9) = -t
Square both sides:
-√(6t - 9)² = -t²
-(6t - 9) = -t²
Add t² to both sides:
t² - 6t + 9 = 0
(t - 3)(t - 3) = 0
t = 3
Answer is C