# maths help me urgently!!!!!!

rationalise [1-(2i^2)]/i
Plz help show we working so that i can learn

1. 👍 0
2. 👎 0
3. 👁 53
1. i^2 = -1
1 - 2(-1) = 3
so this is
3/i
multiply top and bottom by i
3 i/-1
or
-3i

1. 👍 0
2. 👎 0
posted by Damon

## Similar Questions

1. ### calculus help

integrate cos^10xdx.. .plz show working i really wanna learn these thanks anyway

asked by newton on April 17, 2016
2. ### maths

plz help me to find quickly with al steps 5+2^3/7+4^3 rationalise denominator

asked by daahin on April 24, 2014
3. ### math

Big Question: To rationalize a fraction means to remove all non-rational numbers from the denominator of the fraction. Rationalise (a^2)/(3+√b^3) by multiplying the numerator and denominator by 3 − √b^3, and then evaluate

asked by Anonymous on November 24, 2017
4. ### calculus plz help me

Show that the numerical value of the radius of curvature at the point (x1, y1) on the parabola y^2=4ax is [2(a+x1)^3/2)]/a^1/2. If c is the centre of the curvature at the origin O and S is the point (a, 0), show that OC=2(OS) plz

asked by marvin on September 16, 2016
5. ### Child development

Compared to adults, when children perform complex tasks they a.use less working memory. b.are likely to perform fewer processes automatically. c.are unlikely to exceed the capacity of their working memory. d.use more sensory

asked by Woody on October 9, 2015
6. ### Function plz help!!!

If a function u(x,y)=arctan(y/x) deduce the laplace equation of the function. plz show working i don't no where to start from...plz thanks

asked by Collins on December 12, 2015
7. ### trigonomentry help!!!

if one of the root of the equation ax^2+bx+c=0 is four times the other show that 4b^2-25ac=0... help please show working plz

asked by Philip on April 3, 2016
8. ### Maths-equation

(x+y)+(y+z)=5(x+y)(y+z) (x+z)+(y+z)=7(x+z)(y+z) (x+y)+(x+z)=6(z+x)(x+y) plz can at least see the working and learn am studying maths on my own sir steve told me that x=5/24 y=7/24 z=1/24 but i don,t know how he got my paper is

asked by philip!!! on April 14, 2016
9. ### calculus too hard help

if y=x^x^x^x... dy/dx=? plz show working thanks got no ideal at all

asked by sam on May 2, 2016
10. ### maths need help

150sinx=x+69.98 find x plz show me working

asked by ramsey on September 28, 2016

More Similar Questions