Solve 3x^2+7x-13=7 to find x.

Firstly, you need to get the equation to equal zero, so that you can use the quadratic formula to solve. Therefore you subtract 7 from both sides, meaning the equation becomes: 3x^2+7x-20=0. Recall the quadratic formula: x =( -b +/- sqr root(b^2-4ac))/2a, when the equation is ax^2+bx+c, this means that a = 3, b = 7 and c = -20. Subbing this into the formula you get that x = -4 and x = 1.67 (to 2 dp).

EM
Answered by Ellie M. Maths tutor

3217 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

LOWER TIER a) Multiply the following out: (x+3)(x-4). b) Factorise the following equation into two bracket form: x^2+7x+12


120 men and 80 women were asked if they drive to work. Altogether 1/4 of people said yes. And a 1/3 the of men said yes. What fraction of women said yes?


Find the values of x when x^2-6=x


Solve the simultaneous equations. (1) 2x + y = 18 (2)x − y = 6


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