Question

splitting the middle term x²- 8x - 1920​

Answer 1

Answer:

x²-48x+40x-1920

(x-48)(x+40)

x= 48 and -40

Answer 2

Answer:

$x {}^{2} - 8x - 1920 \\ x {}^{2} - 8x + 1912x - 1920 \\ x(x - 8) + 4(x - 8) \\(x + 4)(x - 8) \\ x + 4 = 0 \\ x = - 4 \\ x - 8 = 0 \\ x = 8$