Question

a + 2b - c+d; 2 - d + 3c + a;
5b - 2c + 3 - d
​

Answer 1

Answer:

=》a+a+2b-5b-c-2c+3c+d-d-d+3-2

$a {}^{2} + 3b - 4c + d { }^{2} + 1$

this will be the ANSWER.