College Algebra

Let Z be equal to (2-5i)

The question is

z^2 +iz -(5+i)
The answer I got for this was
-22 + 18i but it isn't correct on my homework page please help/

  1. 👍 0
  2. 👎 0
  3. 👁 37
  1. z^2 +iz -(5+i)
    = (2-5i)^2 + i(2-5i) - (5+i)
    = 4 - 20i + 25i^2 + 2i - 5i^2 - 5 - i
    = 4 - 20i - 25 + 2i + 5 - 5 - i
    = -21 - 19i

    1. 👍 0
    2. 👎 0
    posted by Reiny

Respond to this Question

First Name

Your Response

Similar Questions

  1. algebra ineqUALITIES

    can you check these tell if the number after the: color is a solution x < 7; 7 i say yes p > -3;3 i say yes k is greater than or equal to 5; 0 i say no 3z is less than or equal to 12;4 i say yes n - 5 > 3; 6 i say no 2g + 8 is

    asked by marko on November 2, 2011
  2. math

    Hi, I had a question about exponential functions. If f(x)=ab to the x power, were a does not equal zero, b is greater than 0 and b does not equal one. Therefore if b=1/2, then the graph of the function never crosses the y-axis.

    asked by Arianna on February 27, 2008
  3. Stats

    Richard has just been given a 4-question multiple-choice quiz in his history class. Each question has five answers, of which only one is correct. Since Richard has not attended class recently, he doesn't know any of the answers.

    asked by Collie on October 3, 2012
  4. Algebra problems

    I have some problems that I would like checked please. Find and simplify the difference quotient f(x+h)-f(x)/h, h can not equal 0 for the given functions. 1. f(x)=x^2+3x+9- I got 2x+h+3 Evaluate the piecewise function at the given

    asked by Soly on September 5, 2007
  5. calculus

    Consider the function f(x)=65x−cos(x)+2 on the interval 0 less than or equal to x less than or equal to 1. The Intermediate Value Theorem guarantees that there is a value c such that f(c)=k for which values of c and k? Fill in

    asked by lauren on February 2, 2012
  6. Math

    1) When will the dependent variable in the equation y=√x+4-3 equal or exceed to 4? A) x > or equal to -0.17 B) x > or equal to 45 C) x > or equal to 48 D) x > or equal to 53 2) The function t=√d/16 models the time (t) in

    asked by Tia on April 7, 2015
  7. algebra

    Need some one check my homework. Evaluate 3p/q when p=2 and q=6. Answer:1 Use < > or = for __ to write a true sentence: 0.001 __ 0.0010 Answer:< Question 3 Evaluate -3/8 - 5/8. Answer:7 Question 4 Evaluate: 84 + (-99) + 44 - (-18)

    asked by Lisa on May 29, 2014
  8. math

    The fraction 5Y3X/2Y8, in which x and Y stand for two unknown digits, represents a division which results in a quotient that is a whole number. Which of the following is (are) true? 1. X may equal 2. 11. X may equal 6 or 0. 111. X

    asked by vincent on August 3, 2013
  9. Algebra

    1. (2x-6)/(21) divided by (5x-15)/(12) 2. Solve (x)/(x-9)-4=(9)/(x-9)..I got -6, is that correct? 3. Add. Express your answer in simplest form...(4)/(s)+(6)/(s^2).. 4. Add. Express your answer in simplest

    asked by Helpless in Math on May 27, 2007
  10. English

    Question 7 (multiple choice) Which of the following is NOT a difference between mediocre and great efforts? talent persistence going the "second mile" A? Question 8 (multiple choice) In the Declaration of Independence, Thomas

    asked by Bri on November 20, 2017
  11. Algebra

    The (absolute value) x-20 (absolute value) is less than or equal to 6. I did it first with six positive and got x is lesss than or equal to 26. Then I made the six negative and got x is less than or equal to 14. But this is

    asked by Andrea on October 12, 2009

More Similar Questions