4y(y+3)-(y+4)^2 10(1-x)^2+20x (y-4)(y+4)-(y-3)^2 упростить

Question

4y(y+3)-(y+4)^2

10(1-x)^2+20x

(y-4)(y+4)-(y-3)^2

упростить

Answer 1

4y(y+3)-(y+4)^2=4y^2+12y-(y^2-8y+16)=3y^2+4y-16
10(1-x)^2+20x=10(1-2x+x^2)+20x=10x^2+10
(y-4)(y+4)-(y-3)^2=y^2-16-(y^2-6y+9)=6y-25