Question

Multiply and simplify: (2a – 1)(2a + 1)

A. 4a2 – 1
B. 4a2 + 1
C. 4a2 + -4a – 1
D. 4a2 + 4a – 1

Answer 1

You can do this in two ways.
* (a + b)(a - b) = a^2 - b^2
* Really multiply them

Answer 2

Use this formula:

\[(a-b)(a+b) = a^2 - b^2\]

Answer 3

\( \color{Black}{\Rightarrow 2a(2a + 1) - 1(2a + 1)}\)

\( \color{Black}{\Rightarrow 4a^2 + 2a - 2a - 1}\)

Answer 4

B ?

Answer 5

4a^2+2a-2a-1

Answer 6

Na, it's -1 not +1

Answer 7

Check it again It is not B...

Answer 8

It's A.

Answer 9

I prefer really multiplying them for understanding purposes

Answer 10

Thanks viper for making it easy for the senior...

Answer 11

yw:)

Answer 12

LOL haha

Answer 13

@TheViper : BECOME MY FAN SO I CAN MESSAGE YOU.

Answer 14

k