## MYTUTOR SUBJECT ANSWERS

440 views

### Find Solution to x^2 + x - 2=0

Using the factorisation method.

the factorised solution will look like (x+a)(x+b) = 0

by multiplying these two brackets we get the equation:

x^2 + a.x+b.x + a.b = 0

so vomparing this to the equation in the question we see

a.b = -2        and       a+b = 1    and   a = -2/b

using substitution:

b^2 - 2 = b

b(b-1) = 2      so     b=2   (try substituting this in)

if b = 2 then a = -1

so the solution is

(x - 1)(x + 2) = 0

10 months ago

Answered by Matthew, a GCSE Maths tutor with MyTutor

## Still stuck? Get one-to-one help from a personally interviewed subject specialist

#### 531 SUBJECT SPECIALISTS

£36 /hr

Steven A.

Degree: Bioscience (Masters) - Durham University

Subjects offered:Maths, Science+ 5 more

Maths
Science
Human Biology
English
Chemistry
-Personal Statements-

“Hey! I'm Steven, 18 years old and I'm studying Biochemistry at Durham University. I love tutoring people, to put it simply. At my college i was a tutor to a student in the year below me for chemistry and growing up with a younger sist...”

£22 /hr

Neha C.

Degree: Medicine (Bachelors) - Birmingham University

Subjects offered:Maths, Biology

Maths
Biology

“Passionate, patient and pleasant tutor, tutoring students on maths and science subjects.”

£36 /hr

Ignacio P.

Degree: Aerospace Engineering MEng (Masters) - Bristol University

Subjects offered:Maths, Spanish+ 5 more

Maths
Spanish
Science
Physics
Further Mathematics
Chemistry
-Personal Statements-

“Author of The 3-Step Method to Achieving (under publishing) - APPLIED NEUROSCIENCE & COACHING FOR EXPLOSIVE RESULTS IN MATH, PHYSICS, SPANISH & MORE!”

#### About the author

Matthew P.

Currently unavailable: for new students

Degree: Electronic & Electrical Engineering (Bachelors) - Southampton University

Subjects offered:Maths, Physics+ 1 more

Maths
Physics
Electronics

“About me: I'm an undergarduate Electronic Engineer studying at the University of Southampton. I really enjoy working on new projects, such as designing robots and other rasberry pi projects, and it stems from a love of Physics and Mat...”

MyTutor guarantee

### You may also like...

#### Posts by Matthew

Convert the decimal number 165 to binary

Explain the difference between forced vibration and resonance in an oscillating object.

find general solution to: x(dy/dx) + 2y = 4x^2

Find Solution to x^2 + x - 2=0

#### Other GCSE Maths questions

Factorize x³-x

How would one multiply out brackets?

What is meant by 'the degree of a polynomial'?

Simplify 3!/5!

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this.