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SOLUTION: Please help me solve these: 5 x squared + 9x - 1 = 0 4 x sq + 12x + 7 = 0
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Question 236463
:
Please help me solve these:
5 x squared + 9x - 1 = 0
4 x sq + 12x + 7 = 0
Answer by
jim_thompson5910(33401)
(
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