Question

Ajutati ma va rog frumos toate exercitile care sunt cu + le puneti cu - dupa formula,dau coroane ex 1 si 2,dau coroana va rog

Answer 1

1. a) (x-y)^2 = x^2 - 2xy + y^2

b) (a-3)^2 = a^2 - 2a×3 + 3^2 = a^2-6a+9

c) (x-a)^2 = x^2 - 2ax + a^2

d) (b-a)^2 = b^2 -2ab + a^2 

e) (3-x)^2 = 3^2 - 2×3×x + x^2 = x^2-6x+9

f) ( 4-a)^2= a^2 - 8a + 16


2. a) (2x-3y)^2 = (2x)^2 -2×2x×3x +(3y)^2

b) ( 3a-5b)^2 = 9a^2 - 30ab + 25b^2

c) ( rad 3x - rad 2y )^2 = 3x - 2 rad 6xy + 2y

d) (1/3a-2x)^2 = 1/9a^2 -4/3ax +4x^2

e) ( rad 3 -3b )^2 = 3 - 6 rad 3b +9b^2

f) (b/4 - a/3)^2 = b^2/16 - ab/6 + a^2/9

Answer 2

a) (x+y)^2 = x^2 + 2xy +y^2
b) (a-3)^2 = a^2 -6a+9
c) (x+a)^2 = x^2+2xa+a^2
d) (b-2) ^2 = b^2-4b+4
e) (3-x)^2 = 9-6x+x^2
f) (4+a)^2 = 16+8a+a^2

2.
a) (2x-3y)^2 = 4x^2-12xy+9y^2
b) (3a+5b)^2 = 9a^2 +30ab+25b^2
c) (v3x - v2y)^2 = 3x^2-2xyv6+2y^2
d) (a/3 +2x)^2 = a^2/9 + 2ax/3+4x^2
e) (v3 +3b)^2 = 3+3bv3+9b^2
f) (b/4 - a/3)^2 = b^2/16 -2ab/12+a^2/9 = b^2/16 -ab/6+a^2/9