Math 111 - Sept 26, 2011

Test 2.3-3.5 - Oct 5 (perhaps - not likely - 7).

Solve

let

or

or

or or or

3.2 Quadratics that we can't factor:

Quadratic formula: then

I will also show you completing the square...

Ex: Can't be factored...

or are the answers...

Check my work...

note

yes...

Same problem by completing the square...

move the 5 to other side

add 1 to both sides

factor the left side

take square roots

subtract 1 from both sides

Another

also by quad form...

Another:

By completing the square:

is called the discrimate:

if the disc. is positive then the (two) answers will be real

if the disc. is negitive then the answers will be complex (they will have i's in them)

if the disc. is zero then there is only one answer ( )

let