单选题If (x+7) (x-3) = 0, then x = ______.A7 or 3B7 or -3C-7 or 3D-7 or -3E-4 or -3
单选题
If (x+7) (x-3) = 0, then x = ______.
A
7 or 3
B
7 or -3
C
-7 or 3
D
-7 or -3
E
-4 or -3
参考解析
解析:
If (x+7)(x-3) = 0, then either or both factors may be equal to 0. If x+7 = 0, then x = -7. Also, if x - 3 = 0, then x=3. Hence, x may be equal to -7 or 3.
If (x+7)(x-3) = 0, then either or both factors may be equal to 0. If x+7 = 0, then x = -7. Also, if x - 3 = 0, then x=3. Hence, x may be equal to -7 or 3.
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