Find two solutions to the quadratic equation x^2 + 2x - 15 = 0

Firstly, we need to find two numbers that multiply together to make -15 and sum together to make +2. We try a few numbers and find that the solution is -3 and 5, as -3 x 5 = -15 and -3 + 5 = 2.Next you input these numbers into the brackets, like this: (x-3)(x+5)=0. This is the factorised equation.Now to find the two solutions, we let x-3 and x+5 equal 0. Therefore:x - 3 = 0 , x = 3 x + 5 = 0 , x = -5

JG
Answered by James G. Maths tutor

3827 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

A t-shirt is in the sale section of a store. It has 20% off and the new sale price is £12. What was the original price of the t-shirt?


An isosceles triangle has a base with length x+4 and the other two sides have length x+3. The perimeter of this isosceles triangle is 16cm. Find the area of the triangle.


How do you complete the square?


Make x the subject of the following formula: 2x-4=2y.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences