ok class I'm gonna teach you how to use
the quadratic formula to solve a
quadratic equation. your standard
quadratic equation will take the form
aX squared plus Bx plus C equals 0 ok if
this doesn't equal 0,
subtract whatever number this is from both sides, and make it 0
That's how we start out
Let's start with a Quadratic equation
a equals 4, b equals negative 2, and  C equals
negative 5
 
The quadratic formula solves for values of x that make this statement true
It  follows the form:
 
 
 
 
Placing a, b, and c values in to this equation we get:
 
Don't forget positive and negative symbols
 
Simplifying this statement: The negatives make this 2 positive,
 
(-4)(2)(-5) = 80
 
we could combine these these further,
 
the square root of 84 can be broken up into the square root of 4 times the square root of 21
 
Simplifying further:
since there is a two in each of these we candivide everything by two and we get:
 
since it's a plus or minus we can rewrite this because there's going to be two values of x
 
those are answers
so that's the work I expect
when you are  finished using the quadratic formula your work should look something like this
yeah
