2a-3b+c= 2* 1.5 - 3* 1.2+ 0.1 = 3 - 3.6+ 0.1=-0.6 + 0.1= -0.5
-24-8х+х=4
-7х=28
х=-4
...............
126z^2 +6= (7z+1)(18z+7)
126z^2+6=(126z^2+49z+18z+7)
126z^2-126^2-49z-18z=7-6
-67z=1
z=-1/67
Это уравнение .........
Решение во вложении
..................................
(a^2 - 36)(a^2 + 36) - (a^4 - 36a^2 + 324) =
= a^4 - 1296 - a^4 + 36a^2 - 324 =
= 36a^2 - 1620 =
= 36(a^2 - 45)
36* (1/36 - 45) = 1 - 45*36 = - 1619