Question

думайте и приобразовывайте!​

Answer 1

$left(b-3right)left(b+3right)+left(2b+3right)^2 = \= b^2-9+4b^2+12b+9=\=5b^2+12b$

$left(y-2right)left(y+3right)-left(y-1right)^2=\y^2+y-6-left(y^2-2y+1right)=\=y^2+y-6-y^2+2y-1=\=3y-7$

$left(4x-3right)^2-6xleft(4-xright)=\=16x^2-24x+9-24x+6x^2=\=22x^2-48x+9$

$3left(a-5right)^2+left(10a-8a^2right)=\=3left(a^2-10a+25right)+10a-8a^2=\=3a^2-30a+75+10a-8a^2=\=-5a^2-20a+75$