Answer:
Step-by-step explanation:
I do not know if this is completely correct
49x2−4y2
7x(7x)+7x(−2y)+2y(7x)+2y(−2y)
4x=12
x=12/4
x=3 answer
y=4*3=12 answer.
z=8-3=5 answer.
proof
3+12+5=20
20=20
