SOLUTION: Solve. x^2 � 7x � 4 = 0

Question 88260: Solve. x^2 � 7x � 4 = 0

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Now let's use the quadratic formula to solve for x:

Starting with the general quadratic

the general form of the quadratic equation is:

So lets solve (notice , , and )

Plug in a=1, b=-7, and c=-4

Negate -7 to get 7

Square -7 to get 49

Multiply to get

Combine like terms in the radicand (everything under the square root)

Simplify the square root

Multiply 2 and 1 to get 2

So now the expression breaks down into two parts

or

Which approximate to

or

So our solutions are:
or

Notice when we graph we get:

when we use the root finder feature on a calculator, we find that and .So this verifies our answer
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