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方程的根就是方程的解,利用方程根的定义来解题,往往能起到意想不到的作用。1·正用定义。例1关于x的方程ax2+(a2+2a)x-4=0的一个根是1,求a的值。
The root of the equation is the solution of the equation. Using the definition of the root of the equation to solve the problem can often play an unexpected role. 1 is using definition. Example 1 The root of the equation ax2+(a2+2a)x-4=0 for x is 1, find the value of a.