Question

Calculati :
1) (4x-3)² +5x(x-3)=
2) (1+x)² +(2+x)²+(3+x)²=
3) (x²+y)²-(x²-y)² =

Answer 1

1). (4x-3)^2+5x(x-3)=16x^2-24x+9+5x^2-15x= 21x^2-39x+9. 2). (1+x)^2+(2+x)^2+(3+x)^2= 1+2x+x^2+4+4x+x^2+9+6x+x^2= 3x^2+12x+14. 3). (X^2+y)^2-(x^2-y)^2=x^4+(2x^2)y+y^2-x^4+(2x^2)y-y^2=(4x^2)y.