Browse · MATH Print → jmc algebra junior Problem Let f(x)=x7+ax3+cx If f(5)=3, then find f(−5). Solution — click to reveal f is an odd function, hence f(x)=−f(−x). So f(5)=−f(−5), which means f(−5)=−f(5)=−3. Final answer -3 ← Previous problem Next problem →