Find B and A such that o(x) is continous: o(x)= {13-Bx.     x<-5}           {3x^2 -1.   -5 less than or equal too x<4}            {2x+A.     x greater than or equal to 4}

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.