Functions | Horizontal Line Test Trick | f(x)=x²−4x+5 Injective or Surjective? #modx4maths
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Functions | Horizontal Line Test Trick | f(x)=x²−4x+5 Injective or Surjective? #modx4maths
In this Short, we analyse the function f : R → R defined as f(x) = x² − 4x + 5 and use the Horizontal Line Test (HLT) to check whether the function is injective (one-one) and surjective (onto). By drawing the graph of this upward-opening quadratic, we can clearly see that many horizontal lines cut the graph at two points — which means ...
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