По формуле разности квадратов:
9b² - (b + 3)² = (3b - b - 3)(3b + b + 3) = (2b - 3)(4b + 3)
M=2,потому што
3^2=9, 9^2=81
2^2=4, 4^2=16
<span>12x²-(4x-3)*(3x+1)=-2
12x^2-(12x^2-9x+4x-3)=-2
12x^2-12x^2+5x+3=-2
5x=-5
x=-1</span>
-4.1=1.5x+3.4
-4.1-3.4=1.5x
-7.5=1.5x
x=-1.5
9y²-(3+2y)² = (3y-(3+2y))(3y+(3+2y)) = (3y-3-2y)(3y+3+2y)= (y-3)(5y+3)