前三道.是在看不懂.翻译和解答.谢谢了four times the square of a number is21 mo

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前三道.是在看不懂.翻译和解答.谢谢了four times the square of a number is21 more than eight times the number .what is the number?

依据题意,有以下式子：
设一个数为X,4*X^2=21；
4*X^2>8*X；
接下来,自己也尝试去动动手吧…^-^
英汉词汇：time既有时间的意思,也可以当做次数来说,在作为次数时,是可数名,同时,也有倍数的意思,只要把这个弄清楚了这道题也就迎刃而解了；
其次,square 是平方的意思.
最后,more rather 对于或者大于之类的意思.

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