16-07-2014
Mathematics

contestada

(2+7i)(2-7i)= ==========

Respuesta :

16-07-2014

[tex](2+7i)(2-7i)=4-14i+14i-49i^2\\ \\ 4+49=53[/tex]

Answer Link

Аноним Аноним

16-07-2014

[tex](2+7i)(2-7i)=2^2-(7i)^2=4-49\vfot(-1)=4+49=53\\\\-------------------------------\\i=\sqrt{-1}\\\\i^2=-1[/tex]

Answer Link

Otras preguntas

4. A large university amphitheatre has semi-circle seating with 30 seats in the first row, 32 seats in the second row, 34 seats in the third row, and so on. The

Two sides of a triangle have lengths 6 and 16. What must be true about the length of the third side?

1. La W realiza una encuesta de faborabilidad sobre las reformas al sistema de salud y pensión. El 25% de las personas encuestadas, esta a favor de las reformas

This year you earned $75,500. Last year you earned $72,400. What was the rate of change on your earnings since last year

ack on ore ore 12 ch Question 1 When solving 2x + 5y = 7 - 3x + 4y = 9 by the elimination method, we can eliminate x by multiplying the first equation by 3 and

Mrs Reed buys a car costing £11760 This cost includes VAT at a rate of 20%. How much is the VAT?

Create a flowchart to find the total of 10 negative numbers start from -1.

e investment decision rule for net present value calculations is to invest: A) in the project with the lowest NPV. B) in the project with the lowest discount ra

Find the variance of the data. 251, 224, 237, 255, 268 X = 247 Variance (0²) = [?]

Mrs Majhi deposited a certain amount in her bank account at the rate of 6.5% p.a. If she paid 5% of her interest as income tax and received Rs 4940 net interes