Question

H= (x+4).(x+3)-(x-5)2+(x-6).(x+6)-2x3

Answer 1

H = (x+4).(x+3)-(x-5)2+(x-6).(x+6)- 2x3
H = x² + 3x + 4x + 12 - (2x - 10) + x² + 6x - 6x - 36 -6 
H = 2x² + 7x - 30 - 2x + 10
H = 2x² + 5x - 20
Delta: -b² - 4ac
Delta: 25 - 4*2*-20
Delta: 185 

-b +- raiz 185 / 2a
-5 +- raiz 185 / 4
 
raizes: 
x = - 5 + raiz185 / 4
x = -5 - raiz185 / 4