Question

Which is the correct first step for using the Quadratic Formula to solve the quadratic below?

y=5x2−2x+6



(1 point)
Responses

−6±62−4(−2)(5)√2(−2)
the fraction with numerator negative 6 plus or minus square root of 6 squared minus 4 negative 2 5 end root and denominator 2 times negative 2

−5±52−4(6)(−2)√2(6)
the fraction with numerator negative 5 plus or minus square root of 5 squared minus 4 6 negative 2 end root and denominator 2 times 6

−(−2)±(−2)2−4(5)(6)√2(5)

Answer 1

The third option. With a = 5, b = −2, c = 6 the correct substitution is

x = -(-2) ± sqrt((-2)^2 − 4(5)(6)) / (2(5)),

i.e. x = (2 ± sqrt(4 − 120)) / 10.