(6-p)^2+9*(p-5)=6^2-2*6*p+p^2+9p-9*5=36-12p+p^2+9p-45=p^2-3p-9
при p=-0,4
(-0,4)^2-3*(-0,4)-9=0,16+1,2-9=[b]-7,64[/b]
12.
(-x-4)(x-4)+x*(x+8)=-(x+4)*(x-4)+x^2+8x=-(x^2-16)+x^2+8x=-x^2+16+x^2+8x=8x+16
при х=-(17.4)
8*(-17/4)+16=-34+16=[b]-28[/b]
13.
(y-4)^2+2*(y-9)=y^2-2*y*4+4^2+2*y+2*(-9)=y^2-8y+16+2y-18=y^2-6y+2
при y=-0,1
(-0,1)^2-6*(-0,1)+2=0,01+0,6+2[b]=2,61[/b]
14.
a^2+6a+9+(a+3)*(3-a)=a^2+6a+9+9-a^2=6a+18
при a=-0,5
6*(-0,5)+18=-3+18=[b]15[/b]
15.
(b+3)^2-b^2-3=b^2+6b+9-b^2-3=6b+6
при b=5/6
6*(5/6)+6=5+6=[b]11[/b]