2. Desenvolva os produtos notáveis: a) (20x + y)2 =b) (20x - y...

a) (x+y)²=

x²+2.x.y+y²=

x²+2xy+y²

b) (a+5)²=

a²+2.a.5+5²=

a²+10a+25

c) (1+m)²=

1²+2.1.m+m²=

m²+2m+1

d) (x+2)²=

x²+2.x.2+2²=

x²+4x+4

e) (3x+1)²=

(3x)²+2.3x.1+1²=

9x²+6x+1

f) (2y+3)²=

(2y)²+2.2y.3+3²=

4y²+12y+9

g) (a+3b)²=

a²+2.a.3b+(3b)²=

a²+6ab+9b²

h) (4x+3y)²=

(4x)²+2.4x.3y+(3y)²=

16x²+24xy+9y²

i) (a+7)²=

a²+2.a.7+7²=

a²+14a+49

j) (4+x²)²=

4²+2.4.x²+(x²)²=

x⁴+8x²+16