![]() Step 5: Substitute either value (we'll use `+4`) into the `u` bracket expressions, giving us the same roots of the quadratic equation that we found above:įor more on this approach, see: A Different Way to Solve Quadratic Equations (video by Po-Shen Loh). Step 3: Set that expansion equal to the constant term: `1 - u^2 = -15` Step 1: Take −1/2 times the x coefficient. The following approach takes the guesswork out of the factoring step, and is similar to what we'll be doing next, in Completing the Square. We could have proceded as follows to solve this quadratic equation. (Similarly, when we substitute `x = -3`, we also get `0`.) Alternate method (Po-Shen Loh's approach) We check the roots in the original equation by Now, if either of the terms ( x − 5) or ( x + 3) is 0, the product is zero. (v) Check the solutions in the original equation (iv) Solve the resulting linear equations (i) Bring all terms to the left and simplify, leaving zero on Using the fact that a product is zero if any of its factors is zero we follow these steps: If you need a reminder on how to factor, go back to the section on: Factoring Trinomials. See examples of using the formula to solve a variety of equations. Then, we plug these coefficients in the formula: (-b± (b²-4ac))/ (2a). First, we bring the equation to the form ax²+bx+c0, where a, b, and c are coefficients. Solving a Quadratic Equation by Factoringįor the time being, we shall deal only with quadratic equations that can be factored (factorised). The quadratic formula helps us solve any quadratic equation. ![]() This can be seen by substituting x = 3 in the ![]() The quadratic equation x 2 − 6 x + 9 = 0 has double roots of x = 3 (both roots are the same) In this example, the roots are real and distinct. This can be seen by substituting in the equation: (We'll show below how to find these roots.) The quadratic equation x 2 − 7 x + 10 = 0 has roots of The solution of an equation consists of all numbers (roots) which make the equation true.Īll quadratic equations have 2 solutions (ie.
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