Is the problem 1 - (2 - a)² - (2 - a)(2 + a) - 4a ?
If so
use FOIL on (2 - a)² = (2 - a)(2 - a) = 4 -2a - 2a + a² = 4 - 4a + a²
use FOIL on (2 - a)(2 + a) = 4 + 2a -2a - a² = 4 - a²
Substitute:
1 - [( 2 - a)² ] - [ (2 - a)(2 + a) ] - 4a
1 - [ 4 - 4a + a² ] - [ 4 - a² ] - 4a
Distribute the minus signs:
1 - 4 + 4a - a² - 4 + a² - 4a
Combine like terms:
= -7
1−(2−a)(2)−(2−a)(2+a)−4a
Distribute:
=1+2a+−4+a^2+−4+−4a
Combine Like Terms:
=1+2a+−4+a^2+−4+−4a
=(a^2)+(2a+−4a)+(1+−4+−4)
=a2+−2a+−7
Answer: =a2−2a−7
Is the problem 1 - (2 - a)² - (2 - a)(2 + a) - 4a ?
If so
use FOIL on (2 - a)² = (2 - a)(2 - a) = 4 -2a - 2a + a² = 4 - 4a + a²
use FOIL on (2 - a)(2 + a) = 4 + 2a -2a - a² = 4 - a²
Substitute:
1 - [( 2 - a)² ] - [ (2 - a)(2 + a) ] - 4a
1 - [ 4 - 4a + a² ] - [ 4 - a² ] - 4a
Distribute the minus signs:
1 - 4 + 4a - a² - 4 + a² - 4a
Combine like terms:
= -7