填空题y = mx2In the equation above, m is a constant. If y = 32 when x = 4, then when y = 18, which of the following could be the value of x?____
填空题
y = mx2In the equation above, m is a constant. If y = 32 when x = 4, then when y = 18, which of the following could be the value of x?____
参考解析
解析：
因为y = mx2 ，将x = 4, y = 32代入到等式中32 = m(4)2，2 = m，将y=18代入到y=2x2 ，2x2=9，x=-3或x=3。
因为y = mx2 ，将x = 4, y = 32代入到等式中32 = m(4)2，2 = m，将y=18代入到y=2x2 ，2x2=9，x=-3或x=3。
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