A-REI. Reasoning with Equations and Inequalities
A-REI.A. Understand solving equations as a process of reasoning and explain the reasoning.
A-REI.A.1. Explain each step in solving a simple equation as following from the equality of numbers asserted at the previous step, starting from the assumption that the original equation has a solution. Construct a viable argument to justify a solution method.
A-REI.A.2. Solve simple rational and radical equations in one variable, and give examples showing how extraneous solutions may arise.
A-REI.B. Solve equations and inequalities in one variable.
A-REI.B.3. Solve linear equations and inequalities in one variable, including equations with coefficients represented by letters.
A-REI.B.4. Solve quadratic equations in one variable.
A-REI.B.4.a. Use the method of completing the square to transform any quadratic equation in $x$ into an equation of the form $(x - p)^2 = q$ that has the same solutions. Derive the quadratic formula from this form.
A-REI.B.4.b. Solve quadratic equations by inspection (e.g., for $x^2 = 49$), taking square roots, completing the square, the quadratic formula and factoring, as appropriate to the initial form of the equation. Recognize when the quadratic formula gives complex solutions and write them as $a \pm bi$ for real numbers $a$ and $b$.
- No tasks yet illustrate this standard.
- No tasks yet illustrate this standard.