SOLUTION: Please help me solve these: 5 x squared + 9x

SOLUTION: Please help me solve these: 5 x squared + 9x - 1 = 0 4 x sq + 12x + 7 = 0

Question 236463: Please help me solve these:
5 x squared + 9x - 1 = 0
4 x sq + 12x + 7 = 0
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
# 1

Start with the given equation.

Notice that the quadratic is 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

Rewrite as

Add to to get

Multiply and to get .

or Break up the expression.

So the solutions are or

which approximate to or

# 2

Start with the given equation.

Notice that the quadratic is 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 solutions are or

which approximate to or

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