Question

aplique os produtos notaveis 
a) (7xy - 6m³n²) . (7xy + 6m³n²)
b)(7y² + 3y¤)²
c) (x² + 2/3y)²
d) (2/3bs³ + 5/4a²)³

Answer 1

a) (7xy - 6m³n²) . (7xy + 6m³n²) = 49x²y² - 36m^6.n^4

b)(7y² + 3y¤)² = 49y^4 + 2.7.3.y^².y* + 9y*²  ==> 49y^4 +  42y^².y* + 9y*²

c) (x² + 2/3y)² = x^4 + 4/3x²y + 4/9y²

d) (2/3bs³ + 5/4a²)³ = 

(2/3bs³)³ + 3.(2/3b³s³)².(5/4a²)^1+ 3(2/3bs³ )^1.(5/4a²)² + (5/4a²)³

8/27b³s^9 + 60/36b^6s^6.a²+ 150/48bs³a^4 + 25/16a^6