Express (16x+78)/(2x^2+25x+63) as two fractions

Firstly factorise the denominator to get (2x+7)(x+9). Then make the fraction equal to the seperate fractions with constants.

E.g 16x+78/2x^2+25x+63=A/(2x+7)+B/(x+9). then multiply accross by the denominator to get 16x+78=A(x+9)+B(2x+7)

the subtitute in x to make one term equal 0. e.g x=-9.to get -66=-11B therefor B=-6. then substitue in x=-7/2 to get 22=(11/2)B therfore B=4

so the answer is 4/(2x+7)+6/(x+9)

GD
Answered by Georgia D. Maths tutor

3264 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

How would I sketch the graph sin(x) + sin(2x - π/2) in my exam?


Use integration by parts to find ∫ (x^2)sin(x) dx. (A good example of having to use the by parts formula twice.)


how to write down the differential equation from a word problem, involving rate of change.


Find the x co-ordinates of the stationary points of the graph with equation y = cos(x)7e^(x). Give your answer in the form x = a +/- bn where a/b are numbers to be found, and n is the set of integers.


We're here to help

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

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning