Question

factorise x square - 11 x - 80​

Answer 1

Step-by-step explanation:

x² - 11x - 80

= x² - 16x + 5x - 80

=x(x - 16) + 5(x - 16)

=(x - 16)(x + 5)

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Answer 2

x²-11x-80

= -bplusor minus under root of b²-4ac/2a

=. -(-11)under root of 11²-4(1)(80)/2(1)

=. 11 under root of 121-320/2. Negitive roots give complex numbers so we get complex roots.

If delta(b²-4ac) is less than 0 we get complex roots.