(a^-4)^3*a^6/a^-5= a^-12*a^6/a^-5= a^-12+6*a^6/a^-5= a^-6/a^-5=a^-6+5=a^-1=1/a
2^4=2*2*2*2=4*4=16
5^3=5*5*5=25*5=125
2^4*5*3=a
a=16*125
a=2000
1)a(a+2b)-(b+a)^2=a^2+2ab-(b^2+2ab+a^2)=a^2+2ab-b^2-2ab-a^2= -b^2
2)3(b-1)^2+8b=3(b^2-2b+1)+8b=3b^2-6b+3+8b=3b^2+2b+3
3)2с(8с-3)-(4с+1)^2= 16c^2-6c-(16c^2+8c+1)=<span><u>16c^2</u>-6c-<u>16c^2</u>-8c-1= -14c-1
</span>
(x-1)²=2x²-6x-31
x²-2x+1=2x²-6x-31
x²-2x+1-2x²-6x-31=0
-x²+4x+32=0
x²-4x-32=0
D=16+4*32=16+128=144=12²
x1=4+12/2=8
x2=4-12/2=-4
T^2 + 18t + 56 = 0
D = 324 - 224 = 100
t1 = ( - 18 + 10)/2 = - 8/2 = - 4
t2 = ( - 18 - 10)/2 = - 28/2 = - 14