Answer:
Step 1: Equation at the end of step 1
(((x^{2} )-4xy)+(4(((x
2
)−4xy)+(4 ×(y^{2} )))-3^{2} -z^{2}(y
)))−3
−z
Step 2: Equation at the end of step 2
(((x^{2} )-4xy)+2^{2} y^{2} )-3^{2} z^{2}(((x
)−4xy)+2
y
)−3
z
Step 3: Final Result
x^{2} -4xy+4y^{2} -9z^{2}x
−4xy+4y
−9z
