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What grade did you learn the mathematical formula?
Ninth grade.

The collocation method is chapter 2 1.2. 1 in the first volume of the ninth grade mathematics textbook.

Matching method is a skill to simplify calculation in elementary algebra, which can be used to solve quadratic equations, to distinguish some polynomial graphs in analytic geometry, or to calculate some integral forms in calculus. Changing the quadratic form on the left below into the form on the right is the goal of the matching method: ax+bx+c=a(x-h)+k, where h and k are constants.