SOLUTION: 2x^2+8x+15=0

Question 156718: 2x^2+8x+15=0
Found 3 solutions by jim_thompson5910, oscargut, josmiceli:
Answer by jim_thompson5910(35256)   (Show Source): You can put this solution on YOUR website!
Start with the given equation.

Notice we have a quadratic equation in the form of where , , and

Let's use the quadratic formula to solve for x

Start with the quadratic formula

Plug in , , and

Square to get .

Multiply to get

Subtract from to get

Multiply and to get .

Simplify the square root (note: If you need help with simplifying square roots, check out this solver)

or Break up the expression.

or Reduce

So the answers are or which are both complex (ie they are NOT real solutions)

which approximate to or
Answer by oscargut(2103)   (Show Source): You can put this solution on YOUR website!
P(x)=2x^2+8x+15=0
then
=
=

then
P(x)=0 has not real solutions

Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!

Use the quadratic formula

where

and

I checked one of the answers, and it appeared to
check OK
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