Question on: WAEC Mathematics - 2004
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
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Correct Option: A
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
5(2 – x) + x(2 – x) = 0; (2 – x)(5 + x) = 0
2 – x = 0 or 5 + x = 0; x = 2 or x = -5
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