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math help 2 questions?
5x-3[7-2(6x-7)-3x]
Want to know the steps to reach the conclusion the answer: 50x-63
(2-5i)/(3+4i)
I think i is -1 what method do I use is it foil?
answer: (-14/25)-(23/25i)
2 Answers
- ComoLv 78 years agoFavorite Answer
1.
5x - 3 [ 7 - 12x + 14 - 3x ]
5x - 3 [ 21 - 15x ]
50 x - 63
2.
(2 - 5i)(3 - 4i)
-----------------
(3 + 4i)(3 - 4i)
6 - 23i - 20
---------------
9 + 16
-14 - 23i
------------
25
(-14/25) - (23/25) i
- PranilLv 78 years ago
5x - 3[7 - 2(6x - 7) - 3x]
= 5x - 3[7 - 12x + 14 - 3x]
= 5x - 3[21 - 15x]
= 5x - 63 + 45x
= 50x – 63
(2 - 5i)/(3 + 4i)
= (2 - 5i)(3 – 4i)/(3 – 4i)(3 + 4i)
= (6 - 22i – 20)/(9 + 16)
= (– 14 – 22i)/( 25)
= (– 14/25) – (22i)/( 25)
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