Solve the equation 10-3x-x2 = 0
-
A.
x=2 or-5 -
B.
x= -2 or 5 -
C.
x = 1 or 10 -
D.
x = 2 or 5
Correct Answer: Option A
Explanation
10 – 3x – x2 = 0; 10 – 5x + 2x – x2 = 0
5(2 – x) + x(2 – x) = 0; (2 – x)(5 + x) = 0
2 – x = 0 or 5 + x = 0; x = 2 or x = -5