SOLUTION: Please help me to solve this problem: {{{ x2-4x-7 = 0 }}}, Determine whether the following equation have a solution or not? Justify your answer.

Question 180884: Please help me to solve this problem: , Determine whether the following equation have a solution or not? Justify your answer.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

From we can see that , , and

Start with the discriminant formula.

Plug in , , and

Square to get

Multiply to get

Rewrite as

Add to to get

Since the discriminant is greater than zero, this means that there are two real solutions.

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