Identify quadratic equation: Identify the quadratic equation to be solved.The given quadratic equation is 2x2+18x−4=0.
Factor if possible: Factor the quadratic equation if possible.The quadratic equation does not factor nicely, so we will use the quadratic formula to find the roots.The quadratic formula is x=2a−b±b2−4ac, where a, b, and c are the coefficients from the quadratic equation ax2+bx+c=0.
Identify coefficients: Identify the coefficients a, b, and c from the quadratic equation.For the equation 2x2+18x−4=0, we have:a=2, b=18, and c=−4.
Calculate discriminant: Calculate the discriminant b2−4ac.Discriminant=b2−4acDiscriminant=(18)2−4(2)(−4)Discriminant=324+32Discriminant=356
Calculate roots: Calculate the roots using the quadratic formula.x=2a−b±discriminantx=2×2−18±356x=4−18±356
Simplify roots: Simplify the roots. x=4−18+356 or x=4−18−356These are the most simplified forms of the roots as the square root of 356 cannot be simplified further.