Question

F (x)=(x-6)-(x-3). ( x-12)

Answer 1

F(x) = x - 6 - ( x² - 12x - 3x + 36 )
F(x) = x - 6 - x² + 12x + 3x - 36 = 0
F(x) = -x²+ 15x - 42
F(x) = x² - 15x + 42
delta = 225 -168 = +- V57
x = ( 15 +-V57)/2