# math

posted by .

2i/4-8i

2i/4-8i * (4+8i)/(4+8i)

then i multiplied the top and bottom and got

8i/ 4^2 + 16i/8^2

8/80 + 16i/80

reduce to
4/5 + 2i

is this correct

• math -

You started off ok, but then ...

2i/(4-8i) * (4+8i)/(4+8i)
= (8i + 16i^2)/(16 - 64i^2)
= (8i + 16i^2)/(80)
= (i - 2)/10
or
i/10 - 1/5

## Similar Questions

1. ### Luke, Math , algebra

Sorry it was a type. For the problem multiply and write answer in simplest form. 4/12 multiplied by 10/4 My answer: FOr what i understood i only got to the flipping step which is 4/12 multiplied by 4/10 now what step do i do. you mulitply …
2. ### Algebra II

Is this right? (4-i)(-3+4i) -12+16i+3i-4i^2 -12+19i+4 -8+19i (answer)

A particle p is initially at the point (2, 6) in relation to an origin O, and is moving with velocity (3i + j) m/s. It has a constant acceleration (16i + 24j)m/s^2. Show that after 2 seconds it is moving directly away from O and find …
4. ### Math

A particle A of mass 2.11 kg collides with another particle B of mass 3.86 kg. Their initial velocities are u1 = 2.16i + 0.88j and u2 = 0.7i + 1.12j just before impact. After collision, they both merged and becomes a composite particle, …

6. ### trigonometry

Simplify and write in standard form. 1.) (radical 3 + i radical 15)(radical 3 - i radical 15) 2.) 8 + 16i / 2i Thanks again everyone. Any help is appreciated.
7. ### Maths

There are two complex roots to the quadratic equation z^2 +(1−16i)z+(−80+10i)=0 . What is the value of the larger of the two norms of the two roots?
8. ### Complex numbers

If f(x) is a polynomial with real coefficients such that f(4+3i)=31+16i, then f(4−3i)=a+bi. What is the value of a+b
9. ### trig

Write the complex number in trigonometric form, using degree measure for the argument. -12 - 16i
10. ### maths

(3x + 4) + (5y -1) = 10 - 16i A. x = 2, y = -3 B. x = 1, y = -2 C. x = 3, y = 2 D. x = -3, y = 1 think the answer is C

More Similar Questions