Given the square of a = 3A - 6ab + B, the square of B = - A - 5ab-7b, where a = - 2, B = 1, find the value of a - [2A + (B-A)] There must be a process

Given the square of a = 3A - 6ab + B, the square of B = - A - 5ab-7b, where a = - 2, B = 1, find the value of a - [2A + (B-A)] There must be a process

A-[2A+(B-A)]=A-(A+B)=-B
=a2+5ab+7b
=-2*(-2)+5*(-2)+7
=4-10+7
=1

Know a = 3A square-6ab + b square, B = - a square-5ab-7b square, find the value of - 3A + 2B

-3A+2B
=-3(3a²-6ab+b²)+2(-a²-5ab-7b²)
=-9a²+18ab-3b²-2a²-10ab-14b²
=-11a²+8ab-17b²

A plus B plus C equals 33, a plus a plus B, a plus B minus C equals 9, find the value of a, B, C

a+b+c=33 (1)
a+a+b=9 (2)
a+b-c=9 (3)
From (1) - (2)
c-a=24 (4)
From (2) - (3)
a+c=0 (5)
From (4) + (5)
2c=24
c=12
a=-12
b=33