What is expand (7+4i,1+i)(-9i,1-2i) ?

The solution to expand (7+4i,1+i)(-9i,1-2i) is -7*9i,1-7*2i-4i,1*9i,1-4i,1*2i-9ii,1-2ii

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expand (7+4i,1+i)(-9i,1-2i)

expand

(7 + 4 i, 1 + i) (- 9 i, 1 - 2 i)

- 7 \cdot 9 i, 1 - 7 \cdot 2 i - 4 i, 1 \cdot 9 i, 1 - 4 i, 1 \cdot 2 i - 9 ii, 1 - 2 ii

Solution steps

(7 + 4 i, 1 + i) (- 9 i, 1 - 2 i)

= (7 + 4 \cdot 1 i, + i) (- 9 \cdot 1 i, - 2 i)

Distribute parentheses

= 7 (- 9 i, 1) + 7 (- 2 i) + 4 i, 1 \cdot (- 9 i, 1) + 4 i, 1 \cdot (- 2 i) + i (- 9 i, 1) + i (- 2 i)

Apply minus-plus rules

+ (- a) = - a

= - 7 \cdot 9 i, 1 - 7 \cdot 2 i - 4 i, 1 \cdot 9 i, 1 - 4 i, 1 \cdot 2 i - 9 ii, 1 - 2 ii

(1 + i) e^{i t}

8 (r (x) cos (x) + r (x) sin (x) = 9)

\frac{3 x}{( x + 2 ) ( x + 3 ) ( x + 1 )}

\frac{8 x ( 5 x + 7 )}{( 7 x - 5 ) ^{2}}

\frac{n ( n + 1 )}{n + 2}

What is expand (7+4i,1+i)(-9i,1-2i) ?
The solution to expand (7+4i,1+i)(-9i,1-2i) is -7*9i,1-7*2i-4i,1*9i,1-4i,1*2i-9ii,1-2ii