How do you solve a quadratic equation? eg: x^2 + 2x - 8

Well, when solving quadratic equations we have two options, either A: factorize the equation and solve or B: Use the '-b' formula. Option A is usually a lot quicker but does require you to practice factorizing in order to utilize it fully, whereas option B is consistent and requires less thinking as it simply consists of plugging equations into a formula. For this example, x2 +2x-8, factorizing is the better option. For a quadratic factorization, there are two factors that need to sum to the middle term and their product must equal the final term. In this case, the factors of -8 that sum to 2 which are x=-2 and x=4. This leaves us with (x-2)(x+4), this means that our answers for the quadratic equation are +2 and -4.

AK
Answered by Ahad K. Maths tutor

2414 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

There are n sweets in a bag, 6 of which are orange. If the probablility of eating 2 orange sweets from the bag, one after the other, is 1/3, show that n^2 - n - 90 = 0. State any assumptions made.


Calculate the value of 2^(–3) as a fraction in its simplest form.


find the roots of this following equation: 2x^2+18x+36


Question: Factorise the expressions: 1. X^2 - 9 2. 2X^2 - 14X + 24


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