# How to write a quadratic equation in standard form from a graph

Standard form linear equations Video transcript - [Voiceover] We've already looked at several ways of writing linear equations. You could write it in slope-intercept form, where it would be of the form of Y is equal to MX plus B, where M and B are constants. M is the coefficient on this MX term right over here and M would represent the slope. The complete factoring is: Ignore the factor of 2, since 2 can never be 0. Multiply it all to together to show that it works! We will turn the trinomial into a quadratic with four terms, to be able to do the grouping. Then we have to find a pattern of binomials so we can use the distributive property to put them together like a puzzle!

Remember that the sign of a term comes before it, and pay attention to signs. Make sure to FOIL or distribute back to make sure we did it correctly. Notice that the first one is a 4-term quadratic and the second is a cubic polynomial that includes factoring with the difference of squares.

Use the inverse of Distributive Property to finish the factoring. Note that we had to use the difference of squares to factor further after using the grouping method. Note that the first three terms is a perfect square, and so is the last term. We can use difference of squares to factor.

Then it just turns out that we can factor using the inverse of Distributive Property! You can put the middle terms upper right and lower left corners in any order, but make sure the signs are correct so they add up to the middle term.

If you have set up the box correctly, the diagonals should multiply to the same product. Then we get the GCFs across the columns and down the rows, using the same sign of the closest box boxes either on the left or the top.

Then read across and down to get the factors: Foil it back, and we see that we got it correct! This is the coefficient of the first term 10 multiplied by the coefficient of the last term — 6. Then factor like you normally would: Weird, but it works!

This way we can solve it by isolating the binomial square getting it on one side and taking the square root of each side. This is commonly called the square root method. What we want to do for the square root method is to make a square out of the side with the variable, and move the numbers constants to the other side, so we can take the square root of both sides.

See also how we have the square of the second term 3 at the end 9. Then we have to make sure to add the same thing to the other side. Then we take the square root of each side, remember that we need to include the plus and minus of the right hand side, since by definition, the square root is just the positive.

Another way to think of it is the absolute value of the left side equals the right side, so we have to include the plus and minus of the right side. We are ready to complete the square! We square this number to get 16 and add it to both sides. As an example of why we can do this: Remember that the number inside the square 4 is the same number as the middle term 8 of the original divided by 2.2 Sometimes we will need to determine if a function is quadratic.

Remember, if there is no. x2 term (in other words, a =0), then the function will most likely be linear.

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When a function is a quadratic, the graph will look like a _____ (sometimes upside down. Page 1 of 2 Graphing and Solving Quadratic Inequalities timberdesignmag.com one example each of a quadratic inequality in one variable and a quadratic inequality in two variables. timberdesignmag.com does the graph of y>x2differ from the graph of y≥ x2?

3. How to Find the Inverse of a Quadratic Function. Inverse functions can be very useful in solving numerous mathematical problems. Being able to take a function and find its inverse function is a powerful tool. With quadratic equations.  