Question

find the root by using quadratic formula x^2+7x+12=0

Answer 1

Answer:

x = -4     and       x = -3

Step-by-step explanation:

$x^{2} + 7x +12 = 0$

a= 1 , b = 7 , c = 12

D = $b^{2} - 4ac$

   = 49 - 48 = 1

x = (-b + $\sqrt{D}$ ) / 2a

  = ( - 7 + 1 ) / 2

  = -6 / 2 = -3

x = (-b - $\sqrt{D}$) / 2a

  = ( -7 - 1 ) / 2

  = -8 / 2 = -4