3. For m₁ and m₂ numbers, with m₁ { Prove that the function f:R → R is continuous but not differentiable at x = 0. f(x) = = m₂, define mix + 4 m₂x + 4 if x ≤ 0 if x > 0.

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A: f(-1)=3f'(x)≤2Integrating w.r.t x;∫ f'(x) dx ≤ ∫2 dxf(x)≤2x+Cf(-1)=33=2(-1)+CC=3+2C=5