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Finding constants for continuity

Continuity

Concept 3 of 17 in Continuity and Differentiability

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Think about this

f(x)=x2+1f(x) = x^2 + 1 for x<2x < 2, and f(x)=kx−1f(x) = kx - 1 for x≥2x \ge 2. For one value of kk the two pieces join with no break. Which value?