Question

Me ajudeem;
A) (x + 7) ^2
B)(2x + 7)^2
C)(3x - 8)^2
D)(x + 7) . (x - 7)
E)(4 x - 9)^2
F)(5x + y) . (5x - y)
G)(4a - 9b)^2

Answer 1

Olá!!!

Resolução!,,

a)

= ( x + 7 )²
= ( x )² + 2 • x • 7 + 7²
= x² + 14x + 49

b)

= ( 2x + 7 )²
= ( 2x )² + 2 • 2x • 7 + 7²
= 4x² + 28x + 49

c)

= ( 3x - 8 )²
= ( 3x )² - 2 • 3x • 8 + 8²
= 9x² - 48x + 64

d)

= ( x + 7 ) • ( x - 7 )
= ( x )² - 7²
= x² - 49

e)

= ( 4x - 9 )²
= ( 4x )² - 2 • 4x • 9 + 9²
= 16x² - 72x + 81

f)

= ( 5x + y ) • ( 5x - y )
= ( 5x )² - ( y )²
= 25x² - y²

g)

= ( 4a - 9b )²
= ( 4a )² - 2 • 4a • 9b + ( 9b )²
= 16a² - 72ab + 81b²

Espero ter ajudado!!