Question

7x ao quadrado -17x-12=0

Answer 1

7x² -17x -12 = 0

-17² - 4.7.(-12)
289 - (-336)625

x1 = ( -(-17) + 25 ) / 2 * 7
x1 = 3.

x2 = ( -(-17) - 25 ) / 2 * 7
x2 = -8/14
x2 = -4/7