2015
Mathematics
67ca00ce0c643c71d77dee1f
Solve x2 − 2x − 3 = 0
A.
x = 2 or 1
B.
x = 3 or -1
C.
x = 1 or 0
D.
x = 1 or 2
Correct Answer: x = 3 or -1
Explanation
x2 − 2x − 3 = 0 −3x + x = − 2x − 3x × x = − 3x2 (x2 − 3x)(x − 3) = 0 (x − 3)(x + 1) = 0 Either (x − 3) = 0 or (x + 1) = 0 x = 3 or − 1
x2 − 2x − 3 = 0 −3x + x = − 2x − 3x × x = − 3x2 (x2 − 3x)(x − 3) = 0 (x − 3)(x + 1) = 0 Either (x − 3) = 0 or (x + 1) = 0 x = 3 or − 1THIS WEEK's
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