1
6a^2b^2*(2b-3a^3)
2
(b^2-7)*(b^2-7-b)
(x+2)²=(x+3)²
x²+4x+4=x²+6x+9
x²+4x-x²-6x=9-4
-2x=5
x=-2,5
(8x-1)(2x-3)=16x²-24x-2x+3=16x²-26x+3=(16x²-8x+1)-18x+2=(4x-1)²-18x+2;
(4x-1)²-(4x-1)²-18x+2=38
-18x=36
x=-2
(4sinA - 3cosA)² + (3sin²A + 4cos²A) = 16sin²A - 24sinAcosA + 9cos²A +
+ 9cos²A + 24sinAcosA + 16sin²A = 25sin²A + 25cos²A = 25(sin²A + cos²A) =
= 25