Calculate (7-i*sqrt(6))*(13+i*sqrt(6))
We expand the parentheses to get to the equation: 713-13isqrt(6)+7isqrt(6)-iisqrt(36) which after some further calculations equals to: 91-6isqrt(6)+sqrt(36) [We got +sqrt of 36 because ii*=sqrt(-1)sqrt(-1)= -1, which results in -1(-sqrt(36))=sqrt(36)].Realizing that sqrt(36)=6 we get to the final result: 97-6isqrt(6)
Related Maths A Level answers
All answers ▸Work out the equation of the normal to the curve y = x^3 + 2x^2 - 5 at the point where x = -2. [5 marks]
Find the coordinates of the stationary points for the curve y = x^4 - 2*x^2 + 5.
A car is travelling with a velocity of "0.5t^2+t+2" m/s at t=0 (where t is in seconds), find the acceleration of the car at a) t=0 b)t=2
Solve the inequality |x - 2sqrt(2)| > |x - 4sqrt(2)|.