What is expand v(2,-1)f(4,-1) ?

The solution to expand v(2,-1)f(4,-1) is 2vf,4,-2vf,1-1*4vf,1*1

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expand v(2,-1)f(4,-1)

expand

v (2, - 1) f (4, - 1)

2 v f, 4, - 2 v f, 1 - 1 \cdot 4 v f, 1 \cdot 1

Solution steps

v (2, - 1) f (4, - 1)

= (2, - 1) (4, - 1) v f

Expand

(2, - 1) (4, - 1) : 2, 4, - 2, 1 - 1 \cdot 4, 1 \cdot 1

= v f (2, 4, - 2, 1 - 1 \cdot 4, 1 \cdot 1)

Expand

v f (2, 4, - 2, 1 - 1 \cdot 4, 1 \cdot 1) : 2 v f, 4, - 2 v f, 1 - 1 \cdot 4 v f, 1 \cdot 1

= 2 v f, 4, - 2 v f, 1 - 1 \cdot 4 v f, 1 \cdot 1

k^{2} d x + (x - y + k)^{2} d y

(x + Δ x) 3

(a + c + e)^{2}

\frac{n ^{2} + 23 n}{( x + 2 ) ( x + 23 )}

\frac{x ^{3}}{6} + 3 (x + 2) ln (\frac{x + 2}{2})

What is expand v(2,-1)f(4,-1) ?
The solution to expand v(2,-1)f(4,-1) is 2vf,4,-2vf,1-1*4vf,1*1