Question

B=(x-y^2)(2x^2-y^3)(3x^3-y^4)(4x^4-y^5)(5x^5-y^6) tại x=-4,y=4

Answer 1

\(B=\left(x-y^2\right).\left(2x^2-y^3\right).\left(3x^3-y^4\right).\left(4x^4-y^5\right).\left(5x^5-y^6\right)\)

Thay \(x=-4,y=4\) vào B ta được :

\(B=\left(-4-4^2\right).\left(2\left(-4\right)^2-4^3\right).\left(3\left(-4\right)^3-4^4\right).\left(4\left(-4\right)^4-4^5\right).\left(5\left(-4\right)^5-4^6\right)\)