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use quadratic formula: (-b±√(b^2-4ac))/2a

 

a=3 b= -7 c=-2

 

3𝑥^2-7𝑥-2=0

 

calculator keeps saying math error when i apply the formula?

Guest May 31, 2017

Best Answer 

 #2
avatar+7266 
+2

If you just want to know how to put this in the calculator..........

 

x = ( -b ± √( b^2 - 4ac ) ) / ( 2)          Make sure " 2a " is in parenthesees, otherwise the " a " goes in the numerator.

 

x = ( -(-7) Â± âˆš( (-7)^2 - 4(3)(-2) ) ) / ( 2(3) )

 

You can type it, or just copy and paste this, into the calculator on the home page like this...

First solution:          ( -(-7)+sqrt((-7)^2-4(3)(-2)))/(2(3))

Second solution:     ( -(-7)-sqrt((-7)^2-4(3)(-2)))/(2(3))

 

So...you should get

x â‰ˆ 2.591          and          x â‰ˆ -0.257

hectictar  May 31, 2017
 #1
avatar+24 
+1

3x^2-7x-2=0

x=-0.26

x=2.59

answers in 3s.f.

bennykim0905  May 31, 2017
 #2
avatar+7266 
+2
Best Answer

If you just want to know how to put this in the calculator..........

 

x = ( -b ± √( b^2 - 4ac ) ) / ( 2)          Make sure " 2a " is in parenthesees, otherwise the " a " goes in the numerator.

 

x = ( -(-7) Â± âˆš( (-7)^2 - 4(3)(-2) ) ) / ( 2(3) )

 

You can type it, or just copy and paste this, into the calculator on the home page like this...

First solution:          ( -(-7)+sqrt((-7)^2-4(3)(-2)))/(2(3))

Second solution:     ( -(-7)-sqrt((-7)^2-4(3)(-2)))/(2(3))

 

So...you should get

x â‰ˆ 2.591          and          x â‰ˆ -0.257

hectictar  May 31, 2017

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