Question

（2X+Y）^2-7（2X+Y）-18 (X^2-5X)^2-2(X^2-5X)-24

Answer 1

4x^2+y^2+4xy-14x-7y-18x^4-450x^2+180x^3-2x^2+10x-24=

y^2+4xy-4x-7y-448x^2-18x^4+180x^3-24.

x^4-8x^3+14x^2-2x^2+8x-15=x^4-8x^3+12x^2+8x-15.

.

x^2+y^2=4.