1) 3u² - 4u = 0u(3u - 4) = 0u = 0 or 3u - 4 = 0u = 0 or u = 4/3
2) 10r² + 9r = 0r(10r + 9) = 0r = 0 or 10r + 9 = 0r = 0 or r = -9/10
3) -5y - 9y² = 0-5y(1 + 9y) = 0-5y = 0 or 1 + 9y = 0y = 0 or y = -1/9
4) 8t² - t = 0t(8t - 1) = 0t = 0 or 8t - 1 = 0t = 0 or t = 1/8
1) 3u² - 4u = 0
u(3u - 4) = 0
u = 0 or 3u - 4 = 0
u = 0 or u = 4/3
2) 10r² + 9r = 0
r(10r + 9) = 0
r = 0 or 10r + 9 = 0
r = 0 or r = -9/10
3) -5y - 9y² = 0
-5y(1 + 9y) = 0
-5y = 0 or 1 + 9y = 0
y = 0 or y = -1/9
4) 8t² - t = 0
t(8t - 1) = 0
t = 0 or 8t - 1 = 0
t = 0 or t = 1/8