What is expand (1+0.9z)*(1-0,9z)*(1+2z) ?

The solution to expand (1+0.9z)*(1-0,9z)*(1+2z) is

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expand (1+0.9z)(1-0,9z)(1+2z)

expand

(1 + 0.9 z) \cdot (1 - 0, 9 z) \cdot (1 + 2 z)

1 \cdot 1 \cdot 1 + 1 \cdot 1 \cdot 2 z - 1 \cdot 0, 9 \cdot 1 \cdot z - 1 \cdot 0, 9 \cdot 2 zz + 1 \cdot 1 \cdot 0.9 z + 1 \cdot 2 \cdot 0.9 zz - 0 \cdot 0.9 z, 9 \cdot 1 \cdot z - 0 \cdot 0.9 z, 9 \cdot 2 zz

Solution steps

(1 + 0.9 z) (1 - 0, 9 z) (1 + 2 z)

= (1 + 0.9 z) (1 - 0 \cdot 9, z) (1 + 2 z)

Expand

(1 + 0.9 z) (1 - 0, 9 z) : 1 \cdot 1 - 1 \cdot 0, 9 z + 1 \cdot 0.9 z - 0 \cdot 0.9 z, 9 z

= (1 \cdot 1 - 1 \cdot 0, 9 z + 1 \cdot 0.9 z - 0 \cdot 0.9 z, 9 z) (1 + 2 z)

Expand

(1 \cdot 1 - 1 \cdot 0, 9 z + 1 \cdot 0.9 z - 0 \cdot 0.9 z, 9 z) (1 + 2 z) : 1 \cdot 1 \cdot 1 + 1 \cdot 1 \cdot 2 z - 1 \cdot 0, 9 \cdot 1 \cdot z - 1 \cdot 0, 9 \cdot 2 zz + 1 \cdot 1 \cdot 0.9 z + 1 \cdot 2 \cdot 0.9 zz - 0 \cdot 0.9 z, 9 \cdot 1 \cdot z - 0 \cdot 0.9 z, 9 \cdot 2 zz

= 1 \cdot 1 \cdot 1 + 1 \cdot 1 \cdot 2 z - 1 \cdot 0, 9 \cdot 1 \cdot z - 1 \cdot 0, 9 \cdot 2 zz + 1 \cdot 1 \cdot 0.9 z + 1 \cdot 2 \cdot 0.9 zz - 0 \cdot 0.9 z, 9 \cdot 1 \cdot z - 0 \cdot 0.9 z, 9 \cdot 2 zz

- 25

(y + 1) d x + (4 x - y) d y

2 (x + Δ x)^{3} - 6 (x + Δ x)^{2} - 7 (x + Δ x) + 11

(l - ∣ x ∣) cos (\frac{nπ x}{l})

\frac{4 ( s + 2 )}{s ( s ^{3} + 2 s ^{2} + 3 s + 4 )}

What is expand (1+0.9z)*(1-0,9z)*(1+2z) ?
The solution to expand (1+0.9z)*(1-0,9z)*(1+2z) is