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2x+4-3x+3+8-3x+1=0
-4x=-16
x=4
L=2*(4+2)-3(4-1)+8=20-9=11
P=3*4-1=12-1=11
b)4x-3(x+7)-5x+2(x-1)=9
4x-3x-21-5x+2x-2=9
-2x=32
x=-16
L=4*(-16)-3*(-16+7)-5*(-16)+2*(-16-1)=-64+27+80-34=9
P=9
a)(x-2)²-3(x+1)=(x+2)(x-2)-2
x²-4x+4-3x-3=x²-4-2
x²-7x+1-x²+4+2=0
-7x=-7
x=1
b)(x+5)²-(x+3)(x-3)+56=-30
x²+10x+25-x²+9+56=-30
10x=-120
x=-12
c)4(x-1)²-2(x+2)-19=(2x-3)(2x+3)
4(x²-2x+1)-2x-4-19=4x²-9
4x²-8x+4-2x-4-19-4x²=-9
-10x=10
x=-1