Question

Resolva as expressões notáveis:
a) (2+3a)²=
b)(3-5x)(3+5x)=
c)(1/2-3a)²=
d)(-x+y)=

Answer 1

a)  (2+3a)² = 2² + 2.2.3a + (3a)²= 4 + 12a + 9a²
 
b) (3-5x)(3+5x)= (3²) - (5x)² = 9 - 25x²

c) (1/2 - 3a)² = (1/2)² - 2.1/2.3a + (3a)²= 1/4 -3a + 9a²

d) (-x+y)² = (-x)² + 2(-x).y + y² = x² - 2xy + y²