Question

Resolva:

A) (3x+y)²

B) (2x+3y)³

C) (5+x)²

Answer 1

Resposta:

A)

(3x + y)²

(3x + y).(3x + y)

9x² + 3xy + 3xy + y²

9x² + 6xy + y²

------------------------

B)

(2x-3y)³

(2x-3y) (2x-3y) (2x-3y) =

(4x²- 6xy -6xy +9y²)(2x-3y) =

(4x² -12xy +9y²)(2x-3y) =

8x³-12x²y -24x²y + 36xy² +18xy² -27y³

8x³-36x²y+54xy²-27y³

 ------------------------

C)

(5-x) ²

5²-2.5.x+x²

25-10x+x²

x²-10x+25