Question

Use completing the square to solve for x in the equation (x minus 12) (x + 4) = 9.

Answer 1

Step-by-step explanation:

(x-12)(x+4)=9

x^2-8x-48=9

x^2-8x-57=0

roots of quadratic equation = (-b +/- sqrt(b^2-4ac))/2a

=8+/-sqrt(64+4×57)/2 =12.54, -4.54

hope this helps