SOLUTION: Solve 2x^2 + 5x - 1 = 0 by using quadratic formula. Use coefficients, a=2, b=5, c=-1. My Atttempt: Using quadratic formula w/coefficients given
-(5)+/- sqrt (5^2 - 4(2)
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Question 177509: Solve 2x^2 + 5x - 1 = 0 by using quadratic formula. Use coefficients, a=2, b=5, c=-1. My Atttempt: Using quadratic formula w/coefficients given
-(5)+/- sqrt (5^2 - 4(2)(-1)
x= _______________________________
2(2)
-(5)+/- sqrt (25-4(2)(-1)
x=_____________________________
2(2)
-5 +/- sqrt (25+8)
x=______________________
4
-5 +/- sqrt (33)
x=__________________
4
I got stuck here!!
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given equation.
Notice we have a quadratic equation 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 answers are or
which approximate to or
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