How can you make sure that a quadratic equation is in its standard form?

The form ax2+bx+c=0 a x 2 + b x + c = 0 is called the standard form of the quadratic equation. Notice that standard form is not unique. For example, x2−x+1=0 x 2 − x + 1 = 0 can be written as the equivalent equation −x2+x−1=0 − x 2 + x − 1 = 0

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what events in mexico's history might explain why the country continues to have difficulty improving social justice and economic opportunities for all people?