Question

split the middle term of x^2 - 100x - 560000

Answer 1

x^2-100x-560000=0
${x}^{2} - 800x + 700x - 560000 = 0$
$x(x - 800) + 700(x - 800) = 0$
$(x + 700)(x - 800) = 0$
$x + 700 = 0 \\ x - 800 = 0$
$x = - 700 \\ x = 800$