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# How do you use synthetic substitution to find f(3) and f(-4) for ##f(x)= x^4-8x-11##?

f(3)= 46

f(-4)= 277

f(3)= ##3^4 -8*3-11= 81-24-11=46##

f(-4)= ##(-4)^4 - 8(-4)-11= 256+32-11=277##