SOLUTION: I have to solve using the quadric formula and if there are no real roots , say so. Can you please help me? Page 588 Number 8 x^2 + 9x + 7 = 0

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Question 146569This question is from textbook Beginning Algebra
: I have to solve using the quadric formula and if there are no real roots , say so. Can you please help me?
Page 588
Number 8
x^2 + 9x + 7 = 0 This question is from textbook Beginning Algebra

Found 2 solutions by Alan3354, jim_thompson5910:
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
x^2 + 9x + 7 = 0
Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc)
Quadratic equation (in our case ) has the following solutons:



For these solutions to exist, the discriminant should not be a negative number.

First, we need to compute the discriminant : .

Discriminant d=53 is greater than zero. That means that there are two solutions: .




Quadratic expression can be factored:

Again, the answer is: -0.859945055359741, -8.14005494464026. Here's your graph:

There are 2 real roots, as shown.
Answer by jim_thompson5910(35256)   (Show Source): You can put this solution on YOUR website!

Start with the given equation.


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 .


or Break up the expression.


So our answers are or


which approximate to or

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