evaluate these pls

Question

0

577

1

1. Evaluate 10001^2 - 9999^2

2. Evaluate (-5+2i)/(1+7i)

i=sqrt(-1)

Write your answer in the form a+bi

Guest Feb 20, 2021

+1223

+2

Best Answer

1. $10001^2 -9999^2 = (10001 + 9999)(10001 - 9999) = (20000)(2) = \boxed{40000}$

2. $\frac{-5+2i}{1+7i} \cdot \frac{1-7i}{1-7i} = \frac{-5+2i+35i-14i^2}{50} = \boxed{\frac{9+37i}{50}}$

CubeyThePenguin · Answer 1 · 2021-02-20T06:46:42

1. $10001^2 -9999^2 = (10001 + 9999)(10001 - 9999) = (20000)(2) = \boxed{40000}$

2. $\frac{-5+2i}{1+7i} \cdot \frac{1-7i}{1-7i} = \frac{-5+2i+35i-14i^2}{50} = \boxed{\frac{9+37i}{50}}$