Question

a) 〖( a-2b )〗^2 b) 〖( 3x+2y )〗^2




c) 〖( a-b )〗^2 d) 〖( a-5b )〗^2





e)( 2+a ).( 2-a ) f) ( 3x-4y ).( 3x+4y )

Answer 1

Resposta:

a) 〖( a-2b )〗^2

(a-2b)×(a-2b)=

a^2-2ab-2ab+b^2=

a^2-4ab+b^2

b) 〖( 3x+2y )〗^2

(3x+2y)×(3x+2y)=

9x^2+6xy+6xy+4y^2=

=9x^2+12xy+4y^2

c) 〖( a-b )〗^2

(a-b)×(a-b)=

a^2-ab-ab+b^2=

=a^2-2ab+b^2

d) 〖( a-5b )〗^2

(a-5b)×(a-5b)=

a^2-5ab-5ab+25b^2=

=a^2-10ab+25b^2

e)( 2+a ).( 2-a )

2^2-2a+2a+a×(-a)=

= 4-(a)^2

f) ( 3x-4y ).( 3x+4y )

9x^2+3×4y-3×4y-4y×4y=

=9x^2+0-16(y)^2

espero que isso ajude vc

Answer 2

Oie, Td Bom?!

a)

$= (a - 2b) {}^{2}$

$= a {}^{2} - 2a \: . \: 2b + (2b) {}^{2}$

$= a {}^{2} - 4ab + 4b {}^{2}$

b)

$= (3x + 2y) {}^{2}$

$= (3x) {}^{2} + 2 \: . \: 3x \: . \: 2y + (2y) {}^{2}$

$= 9x {}^{2} + 12xy + 4y {}^{2}$

c)

$= (a - b) {}^{2}$

$= a {}^{2} - 2ab + b {}^{2}$

d)

$= (a - 5b) {}^{2}$

$= a {}^{2} - 2a \: . \: 5b + (5b) {}^{2}$

$= a {}^{2} - 10ab + 25b {}^{2}$

e)

$= (2 + a) \: . \: (2 - a)$

$= 2 {}^{2} - a {}^{2}$

$= 4 - a {}^{2}$

f)

$= (3x - 4y) \: . \: (3x + 4y)$

$= (3x) {}^{2} - (4y) {}^{2}$

$= 9x {}^{2} - 16y {}^{2}$

Att. Makaveli1996