Question

What will be the remainder of 15 cube plus 16 cube plus c cube + 17 cube + 18 cube +19 cube+ 20 cube?

Answer 1

Step-by-step explanation:

answer will come on the verification of trial and error method

Answer 2

Answer:

(ax+by)^2+(ay-bx)^2

{(ax)^2+(by)^2+2×ax×bx}+{(ay)^2+(bx)^2-2×ay×by}

(a^2x^2+b^2y^2+2abxy)+(a^2y^2+b^2x^2-2abxy)

a^2x^2+b^2y^2+abxy+a^2y^2+b^2x^2-2abxy

a^2x^2+b^2y^2+a^2y^2+b^2x^2

a^2(x^2+y^2)+b^2(x^2+y^2

(a^2+b^2)(x^2+y^2)