Question

Part 1: Solve the following equation using one of the methods listed below.
Part 2: Using complete sentences, explain why you chose the method you used.

Equation:
0 = x2 + 10x + 5

Methods:
Completing the Square
Factoring
Quadratic Formula
Graphing

Answer 1

Completing the square should do it

Answer 2

But how?

Answer 3

that equation cannot be factored so your only option is to complete the square of the quadratic formula...

do you know how to do any of these two?

Answer 4

*or the quadratic formula

Answer 5

Yes i do

Answer 6

i suggest quadratic formula since it is easier...

Answer 7

quadratic formula is \(\large x=\frac{-b\pm\sqrt{b^2-4ac}}{2a} \)
to use the quadratic formula, the equation must be written in this form: \[\large 0= ax^2+bx+c\]

since it's already written in this form can you tell me what
a=
b=
c=
??

Answer 8

a = 1, b = 10 and c = 5 @dpaInc

Answer 9

yes.. so all you gotta do now is put those values in to the quadratic formula.... notice you will have 2 solutions because of the plus/minus.....:)

i can verify your answer if you want. just tell me your answer...:)

Answer 10

@dpaInc -10 +or- √80 / 2

Answer 11

yes... this is what you mean right?
\[\large x=\frac {-10\pm\sqrt{80}}{2} \]

Answer 12

yes

Answer 13

ok... that is correct...
but does your teacher want it simplified?

Answer 14

no

Answer 15

good...:)

Answer 16

you can use your calculator to get a decimal approximation for that value....