Question

Skrócone mnożenie - (x-5)2 -(y+6)2 -(2a+3b)2 - (5a-4b)2 -(x+4)3 -(y-5)3 cyfry po za nawiasem to potegi (te malutkie cyferki ) ;d

Answer 1

a więc 

 

(x-5)^2=x^2+25-10x

(y+6)^2=y^2+36+12y

(2a+3b)^2=4a^2+9b^2+12ab

(5a-4b)^2=25a^2+16b^2-40ab

(x+4)^3=x^3+64+12x^2+48x

(y-5)^3=y^3-15y^2+75y-125

 

^oznacza potąge

Answer 2

(x-5)^2-(y-+6)^2-(2a+3b)^2-(5a-4b)^2-(x+4)^3-(y-5)^3=

=(x^2-10x+25)-(y^2+12y+36)-(4a^2+12ab+9b^2)-(25a^2-40ab+16b^2)-(x^3+4x^2+16x+64)-y^3-5y^2-25y+125)=

=x^2-10x+25-y^2-12y-36-4a^2-12ab-9b^2-25a^2+40ab-16b^x^3+4x^2-16x-64-y^3+5y2+25y-125=

= -3x^2-26x+4y^2+13y-29a^2+28ab-25b^2-x^3-y^3-200