Question

solve by formula method -x² - 24x + 81 = 0​

Answer 1

Step-by-step explanation:

-x² -24x +81 =0

-x² -27x +3x +81 =0

-x(x + 27) + 3( x + 27) = 0

= (x +27) ( -x + 3) =0

Answer 2

Answer:

a=-1 b=-24 c=81

x=-b+-√b^-4ac÷2a

-(-24)+-√(-24)^-4×(-1)×81÷2×(-1)

+24+-√576+324÷-2

+24+-√900÷-2

+24+-30÷-2

if (+) + 24 + 30 ÷ -2 = 54 ÷ -2 = -27

if(-) +24 - 30 ÷ -2 = -6 ÷ -2 = 3

x = -27 or 3