3.4 Solve Using quadratic formula

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Presentation transcript:

3.4 Solve Using quadratic formula

What is the quadratic formula? The formula is: Be careful of your SIGNS!!!!! Don’t forget to simplify your radical as much as possible!

What is a discriminant? The discriminant is the radical part of the quadratic formula: It tells us how many answer and what type we should have: If the discriminant is positive, there are ______. If the discriminant is zero, there is __________ If the discriminant is negative, there are _____

Let’s try some: 4x2 – 8x + 5 = x + 3 3 = -2x2 + 4x

2x2 – 15x = 0…….. Uh oh, something is missing!

HW: p. 127 #5 - 18