Complete the square of the equation below.

Q. Complete the square : x2 + 4x - 12A. Completing the square is putting the given equation into the form (x + a) 2 + bFirst, a = the coefficient of x 2so in this case a = 4 = 2 Then to find b we calculate how to get to our desired equation from the expansion of (x + a)2so in our example we calculate (x + 2)2= (x + 2) (x + 2) = x2 + 4x + 4but we want x2 + 4x - 12so how do we get from 4 to -12?-12- 4 = -16 = bNow we have found both answers, don’t forget to sub them back into the desired format to get us that last mark!!!ANS = (x + 2)2 -16

VY
Answered by Victoria Y. Maths tutor

2725 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

In a group of 120 people, 85 have black hair, 78 have brown eyes and 20 have neither black hair nor brown eyes. Find the probability of a random person being picked having black hair, given they have brown eyes


p^2 x p^2


Calculate the equation of a line that passes through the point (2,4) and has a gradient of 1.5 in the form y=mx+c


ABC are points on a circle, centre O. AO=9cm, OC=9cm and AC=15cm. Find the angle ABC.


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