4(1.5x-3) -5.5x = 10
6x-12-5.5x-10 = 0
0.5x-22 = 0
0.5x = 22
x = 22/0.5 = 44
(4.4а+5.2b)²=(4.4a)²+(5.2b)²=19.36a²+27.04b²
(5.2x+3.6y)²=(5.2x)²+(3.6y)²=27.04x²+12.96y²
1)4^3-x^3=(4-x)(16+4x+x^2)
2)4^3+x^3=(4+x)(16-4x+x^2)
49x^2 + 56xy - 56 xy - 64y^2 - 40 x^2 +68y^2= 9x^2+4y^2