solve by formula method -x² - 24x + 81 = 0
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Answered by
2
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
Answered by
1
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
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