alleryStart learning →At which x is the tangent to y = x^2 - 4x + 5 parallel to the x-axis?
Ax = 4
Bx = 2
Cx = 5
Dx = 1
Answer & Solution
Correct answer: B. x = 2
A horizontal tangent needs dy/dx = 2x - 4 = 0, so x = 2.
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