单选题Which of the following equations has a solution in common with x2-2x-15=0?Ax2-6x+9=0Bx2+2x-15=0C2 x2+9x+9=0D2 x2+x-3=0Enone of the above
单选题
Which of the following equations has a solution in common with x2-2x-15=0?
A
x2-6x+9=0
B
x2+2x-15=0
C
2 x2+9x+9=0
D
2 x2+x-3=0
E
none of the above
参考解析
解析:
因为x2-2x-15=0,故x=5或-3,计算几个选项可知,本题选C项。
因为x2-2x-15=0,故x=5或-3,计算几个选项可知,本题选C项。
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