Question

efetue as operaçoes indicadas
A) (3x+4)²-(3x²)
b) [(3x)²-3x(3x-2)-2)-1]²
c)(x+8).(x-5)
d) (a+b)²-(a-b)²

Answer 1

A)
(3x+4)²-(3x²)

9x²+24x+16-3x²

6x²+24x+16
------------------------------------------------------------
b)
[(3x)²-3x(3x-2)-2-1]²

[(3x)²-9x²+6x-2-1]²

[9x²-9x²+6x-3]²

[6x-3]²

18x²-36x+9
------------------------------------------------------------
c)
(x+8).(x-5)

x²-5x+8x-40

x²+3x-40
------------------------------------------------------------
d)
(a+b)²-(a-b)²
a²+2ab+b²-(a²-2ab+b²)

a²+2ab+b²-a²+2ab-b²

2ab+2ab

4ab