15. 2y(4y – 3) – 5 = 0​

Jawaban:

2y(4y – 3) – 5 = 0

2y(4y) + 2y(-3) – 5 = 0

8y^2 – 6y – 5 = 0

2y (4y – 3 ) – 5 = 0

8y^2 – 6y – 5 = 0

8y^2 +4y – 10y – 5 = 0

4y (2y + 1) – 5(2y + 1) = 0

(4y – 5) (2y + 1) = 0

y = 5/4 atau y = -1/2