SOLUTION: Determine whether the following equations have a solution or not? Justify your answer. 5x2 + 8x + 7 = 0

Question 132419: Determine whether the following equations have a solution or not? Justify your answer.
5x2 + 8x + 7 = 0

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
From the quadratic formula

the discriminant consists of all of the terms in the square root. So the discriminant is

the discriminant tells us how many solutions (and what type of solutions) we can expect for any quadratic.

Now let's find the discriminant for :

Start with the given equation

Plug in a=5, b=8, c=7

Square 8 to get 64

Multiply -4*5*7 to get -140

Combine 64 and -140 to get -76

Since the discriminant equals -76 (which is less than zero) , this means there are two complex solutions (ie there are no real solutions). Remember if the discriminant is less than zero, then the quadratic will have two complex solutions.

So the quadratic has no solutions

Notice if we graph , we can see that there are no real solutions. So this verifies our answer.

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