Thursday

January 29, 2015

January 29, 2015

Posted by **Bob** on Thursday, August 16, 2012 at 8:40am.

1.30√-25 x 8√-49

2. 6√-64 + 12√-36

3. 4√-13 - 6√-13

- Algebra2 -
**Reiny**, Thursday, August 16, 2012 at 8:48am30√-25 x 8√-49

= 30√25√-1 x 8√49√-1

=150√-1 x 56√-1

= 8400 (-1)

= -8400 , remember that √-1 x √-1 = i x i = i^2 = -1

do the others the same way, let me know what you got

- Algebra2 -
**Bob**, Thursday, August 16, 2012 at 9:19amI'm Doing Problem 2 Right Now .

But I'm Stuck How Did You Get 150 In the 3rd Line?

- Algebra2 -
**Reiny**, Thursday, August 16, 2012 at 9:39am30√25√-1 x 8√49√-1

= 30 x 5 x √-1 x 8 x 7 x √-1

= 150 x √-1 x 56 x √-1

= 8400 x i^2

= ....

- Algebra2 -
**Sara**, Thursday, August 16, 2012 at 9:50amOh Okay .

I Tried The Other Two Problems.

For #1 I Got 120 As My Answer.

For #2 I Got 37 As My Answer.

- Algebra2 - Sara -
**Steve**, Thursday, August 16, 2012 at 11:21amNope:

6√-64 + 12√-36 = 6*8i + 12*6i = 120i

4√-13 - 6√-13 = (4-6)√-13 = -2√13 i

**Answer this Question**

**Related Questions**

Math - Find an equation of the line that bisects the obtuse angles formed by the...

Algebra - How would i complete these problems? 1. (√6mn)^5 2. ^3√16x...

maths - I will be thankfull to you if you help me to solve the below problem: 6...

Algebra Work Check - 1. 5√6 * 1/6√216 5/6 * √1296 5/6 * √...

Algebra 2 Answer Check - Simplify by rationalizing each denominator. 1. 2/√...

algebra 1 - alright i have a few questions if its ok..? Simplify: 1. -2√(...

Algebra - Simplify the expressions and solve the equations 1. 2√3 - √...

Math help Ms. Sue please - 1. What is the simplified form of the expression? 7m^...

Precalculus - Determine the exact value of cos 465 degrees a) √3 + √...

Math - Determine the exact value of cos 465 degrees a) √3 + √2/2 b...