f (x) = (x^2 + 4)(x^2 + 8x + 25). Find the roots of f (x) = 0

firstly, x2 + 4 = 0 x2 = -4 x = 2i x = -2iSecondly, x2 + 8x + 25 = 0 using the quadratic formulae: x = (-b +- sqrt(b2 - 4ac))/2a x = (-8+-sqrt(64-100))/2 x = -8/2 +- sqrt(-36)/2 x = -4 + 3i x = -4 - 3i

LS
Answered by Laura S. Maths tutor

5077 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

When finding the turning points of a curve, how can I tell if it is a maximum, minimum or a point of inflection?


Prove that the d(tan(x))/dx is equal to sec^2(x).


Express 4 sin(x) – 8 cos(x) in the form R sin(x-a), where R and a are constants, R >0 and 0< a< π/2


The point A lies on the curve y=5(x^2)+9x , The tangent to the curve at A is parralel to the line 2y-x=3. Find an equation to this tangent at A.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences