(a+b)²=a²+2ab+b²
(a-b)²=a²-2ab+b²
(a+/-b+-/c)=a²+b²+c²+/-2ab+/-2ac+/-2bc
(x²+3a)²= (x²)²+2•x²•3a+9a²
x⁴+6x²•a+9a²
e) (7x-5)²=49x²-14x•5+25
49x²-70x+25
b) (3+5x)(3-5x)= 3²-(5x)²= 9-25x²
(1+a+b)²=1+a²+b²+2a+2b+2ab
(2x+y+z)²=4x²+y²+z²+4xy+4xz+2yz
(2x+y+3z)²=4x²+y²+9z²+4xy+12xz+6yz
(5+4a+3b)²=25+16a²+9b²+40a+30b+24ab
(3x+2y+1)²=9x²+4y²+1+12xy+6x+4y
(m+3n+5p)²=m²+9n²+25p²+6mn+10mp+30np
Sper ca te-am ajutat!
