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(2x)2 - 9x - 4 = o

What is the value of the discriminant for this equation?

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Robert J. | Certified High School AP Calculus and Physics TeacherCertified High School AP Calculus and Ph...
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4x2-9x-4 = 0

a = 4, b = -9, c = -4

b2 - 4ac = (-9)2 - 4(4)(-4) = 145 <==Answer

Comments

is the problem supposed to read (2x)^2 or (2x)*2? because that changes the answer completely.