Make sure you have paper and a pen

Make sure you have paper and a pen ready Have a go at these questions while you’re waiting for the session to start GCSE Preparation Course L 6: QUADRATIC EQUATIONS 2 Ask me to go over any questions by typing in the chat box There may be a short delay. @mrskslightbulbmoments https: //mrskslightbulbmoments. wordpress. com/

The Quadratic Formula Note: The equation must be in this form in order to use the formula We can use the quadratic formula to find our solutions when a quadratic expression does not factorise This bit (b 2 – 4 ac) is called the discriminant and tells us how many solutions there are It is most commonly found on a calculator paper, but you may need to use it on a noncalculator paper and leave your answer as a surd @mrskslightbulbmoments if b 2 – 4 ac < 0 then there are no real solutions if b 2 – 4 ac = 0 then there is one solutions if b 2 – 4 ac > 0 then there are two solutions https: //mrskslightbulbmoments. wordpress. com/

The Quadratic Formula Example Your turn… @mrskslightbulbmoments https: //mrskslightbulbmoments. wordpress. com/

HINT The trick is to spot when the question is asking you to use the formula: • The answer is not a whole number (dp or sf) • It asks you to leave it as a surd • The equation does not factorise (easily) @mrskslightbulbmoments https: //mrskslightbulbmoments. wordpress. com/ Have a go at these questions after the session if you need more practice

AREA 2 x 3 x Area=150 cm 2 x+5 x+3 Area=26 cm 2 @mrskslightbulbmoments https: //mrskslightbulbmoments. wordpress. com/

WORDED PROBLEMS @mrskslightbulbmoments https: //mrskslightbulbmoments. wordpress. com/

WORDED PROBLEMS 3) @mrskslightbulbmoments 4) https: //mrskslightbulbmoments. wordpress. com/

APPLIED PROBLEMS Find x @mrskslightbulbmoments https: //mrskslightbulbmoments. wordpress. com/

Extension Questions A) Two integers differ by 3. The sum of their reciprocals is seven tenths. Find the numbers C) B) The diagonal length of a rectangle is 25 cm. Its width is xcm and its height is (x-17)cm. Find x. @mrskslightbulbmoments https: //mrskslightbulbmoments. wordpress. com/

Additional Practice Questions @mrskslightbulbmoments https: //mrskslightbulbmoments. wordpress. com/

Well done! Resources from this lesson Next lesson This Powerpoint will be available to download from my website: mrskslightbulbmoments. wordpress. com Monday 8 th at 5 pm Further practice questions and videos can be found on Corbett Maths: 118 -120, 266, 267 We will be continuing with Quadratic Equations, focusing on Completing the Square and Quadratic Graphs! Check my website for downloadable handouts before the lesson Hosted on & Channel: Mrs K’s Lightbulb Moments Make sure you follow my fb page (@mrskslightbulbmoments) for updates @mrskslightbulbmoments https: //mrskslightbulbmoments. wordpress. com/ 11