Lilireyes Lilireyes
  • 14-06-2017
  • Mathematics
contestada

Given the equation below, which of the following shows the quadratic formula correctly applied? x2+5x-8=0

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CastleRook
CastleRook CastleRook
  • 22-06-2017
This is the concept of quadratic equations, to find out if the expression is correctly applied we solve the equation given using the quadratic formula;
x=[-b+\-sqrt[b^2-4ac]]/(2a)
Given the equation x^2+5x-8=0
then, a=1,b=5 and c=-8
Applying the formula we get:
x=[-5+\-sqrt(5^2-4*1*(-8))]/(2*1)
x=[-5+\-sqrt(25+32)]/2
x=[-5+\-sqrt57]2
The answer is:
x=[-5+\-sqrt57]/2

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