Question

calcule a)(3-½x).(3+½x) b)(⅓x+1).(⅓x-1)

Answer 1

Boa noite

a) 

(3 - x/2)*(3 + x/2) 

= 9 - x²/4 

b)

(x/3 + 1)*(x/3 - 1)

= x²/9 - 1