83÷(−1)=−83 [∵−83−1=83]
Hence, a = 83 [1 mark]
If a+b+c=15 and a2+b2+c2=83 then find the value of a3+b3+c3−3abc
If 83=2p+2, then the value of p is ________. (A) 510 (B) 512 (C) 255 (D) 256