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If (x – y) = 7, then what is the value of (x – 15)3 – (y – 8)3?
0
343
392
2863
(x-15)^3-(y-8)^3 where,x-y =7 => {(x-15)-(y-8)} {(x-15)^2+(y-8)^2+(x-15)(y-8)} We get the above from identity a^3-b^3=(a-b){a^2+b^2+ab} => (x-15-y+8) {(x-15)^2+(y-8)^2+(x-15)(y-8)} => (7–7)…. As,x-y=7 =0
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