(х-4)(х+4)-(х+6)=-16 помогите плиз

Question

(х-4)(х+4)-(х+6)=-16 помогите плиз

Answer 1

( x - 4)( x + 4) - ( x + 6) = - 16
x² - 16 - x - 6 = - 16
x² - x - 6 = 0
D = b² - 4ac = 1 - 4×(-6) = 25 = 5²
x1 = ( 1 + 5) / 2 = 3
x2 = ( 1 - 5) / 2 = - 2