Question

8- Calcule os quadrados da soma.
a) (x + y)2
b) (a + 7)2
c) (3x + 1)2
d) (10x + y)2​

Answer 1

a) (x + y)2 = x² +2xy + y²

b) (a + 7)2 = a² + 2.a.7+7² = a²+14a+49

c) (3x + 1)2 = (3x)²+ 2.3x 1 + 1² = 9x² + 6x + 1

d) (10x + y)2 = 100x² +20xy +y²