If p - 15 = 0 and 2x² + px + 25 = 0; find the values of x.

Solve the quadratic equation 8x² - 14x + 3 = 0

(i) When x ∈ I (integers)

(ii) When x ∈ Q (rational numbers)

Solve, using formula :

x² + x - (a + 2)(a + 1) = 0