Answer:
Explanation:
15x² - 2x - 1 = 0
15x² - 5x + 3x - 1 = 0
5x(3x - 1) + 3x - 1 = 0
(5x + 1)(3x - 1) = 0
x = -1/5, 1/3
8x² - 10x - 3 = 0
8x² - 12x + 2x - 3 = 0
4x(2x - 3) + 2x - 3 = 0
(4x+1)(2x-3) = 0
x = -1/4 , 3/2
16x² - 8x + 3 = 0
This question has complex answers as the D = 64 - 192 < 0
So, ignore this question. It is wrong or it has complex answers.
Use the quadratic formula for it.
9x² - 6x - 2 = 0
This also needs the quadratic formula as the answer is in roots.
8x² - 2x - 3 = 0
8x² - 6x + 4x - 3 = 0
2x ( 4x - 3) + 4x - 3 = 0
(2x + 1)(4x-3) = 0
x = -1/2 , 3/4