Express the following in partial fractions: (x^2+4x+10)/(x+3)(x+4)(x+5)

(x^2+4x+10)/(x+3)(x+4)(x+1) = A/(x+3) + B/(x+4) + C/(x+1) [A(x+4)(x+1) + B(x+3)(x+1) + C(x+3)(x+4)]/(x+3)(x+4)(x+1) = (x^2+4x+10)/(x+3)(x+4)(x+1) [A(x+4)(x+1) + B(x+3)(x+1) + C(x+3)(x+4)] = (x^2+4x+10) A(x^2+5x+4) + B(x^2+4x+3) + C(x^2+7x+12) = (x^2+4x+10) A+B+C = 1 (1) 5A+4B+7C = 4 (2) 4A+3B+12C=10 (3) From (1): A = 1-B-C (4) Sub (4) into (2): 5(1-B-C)+4B+7C = 4 -B+2C = -1 (5) Sub (4) into (3):4(1-B-C)+3B+12C=10-B+8C=6 (6) (6)-(5): -B+8C=6-B+2C = -1 6C = 7 C = 7/6 From (5): -B + 2(7/6) = -1 -B = -1 - 14/6 B = 10/3 From (4): A = 1-(10/3)-(7/6) A = -7/2 Therefore: (x^2+4x+10)/(x+3)(x+4)(x+1) = -7/2(x+3) + 10/3(x+4) + 7/6(x+1)



AS
Answered by Alessandro S. Maths tutor

2769 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

Find the turning points of the curve y=2x^3 - 3x^2 - 14.


Find the two real roots of the equation x^4 -5=4x^2 Give the roots in an exact form.


What is the equation of the normal line to the curve y = 3x^3 - 6x^2 at the point (1, 4)?


A particle P is projected vertically upwards from a point 20m above the ground with velocity 18m/s, no external forces act on it other than gravity. What will its speed be right before it hits the ground? Give your answer to one decimal place.


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