How do I solve x^2 > 6 - x

To solve this question we want to find the range of values that x can be to make the statement true. First we must treat it like a normal quadratic equation and move all of the values onto one side like so: x2 + x - 6 > 0. Next we want to factorise the left hand side to get: (x + 3)(x - 2) > 0.The best thing to do here is to draw the graph of y = (x + 3)(x - 2), to do this it we know it has a positive quadratic shape and at y = 0 (where it crosses the x-axis) x = -3 or x = 2. Now we want all the values of x when y = (x + 3)(x - 2) > 0 so effectively where the graph is above the x-axis. We can see from the graph that the outer values of x are positive and so we can say:x < -3 or x > 2

BH
Answered by Ben H. Maths tutor

3711 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

Can you show me why the integral of 1/x is the natural log of x?


Use the product rule to differentiate y=2xsinx


Express 1/(x(1-3x)) in partial fractions.


An 1kg ball collides normally with a fixed vertical wall. Its incoming speed is 8 m/s and its speed after the collision is 4 m/s . Calculate the change in momentum of the particle. If the collision lasts 0.5 s calculate the impact force.


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