(中4數)(k-6)^2+16=25

1)(k - 6)² + 16 = 25
(k - 6)² + 16 - 25 = 0
(k - 6)² - 3² = 0
(k - 6 - 3) (k - 6 + 3) = 0
(k - 9) (k - 3) = 0
k - 9 = 0 或 k - 3 = 0
k = 9 或 k = 3。
2)(3c - 4)² - 6 = 10
(3c - 4)² - 16 = 0
(3c - 4 - 4) (3c - 4 + 4) = 0
(3c - 8) 3c = 0
3c - 8 = 0 或 3c = 0
c = 8/3 或 c = 0。

始終都係排第三.........