Question

9 класс: 4x² - 17х - 15 = 0

Answer 1

4х^2-17х-15=0
Д=289+240=529, корень из Д=23
х1=17+23/8=5
х2=17-23/8=-0,75

Answer 2

Фото.....................................

Answer 3

To solve the quadratic equation 4x² - 17x - 15 = 0, you can use the quadratic formula:

x = (-b ± √(b² - 4ac)) / 2a

where a = 4, b = -17, and c = -15.

Substituting these values into the formula, we get:

x = (-(-17) ± √((-17)² - 4(4)(-15))) / (2(4)) x = (17 ± √(289 + 240)) / 8 x = (17 ± √529) / 8 x = (17 ± 23) / 8

So the solutions to the equation are:

x1 = (17 + 23) / 8 = 5 x2 = (17 - 23) / 8 = -3/4

Therefore, the solutions to the equation 4x² - 17x - 15 = 0 are x = 5 and x = -3/4.