Solve x^2+6x+1=0 by completing the square
x2+6x+5=0 First of all half the x coefficient and write (x+6/2)2 the take away the (6/2)2 and add on the 5
(x+3)2-9+5=0
(x+3)2-4=0 Simplify the expression
(x+3)2=4 Move 4 to the other side of the equation so you can square root both sides
x+3=+-2 Take the square root of both sides
x=-5, x=-1 Take 3 away from both sides to find the 2 values of x that solve the equation
BS
Related Maths GCSE answers
All answers ▸There are a total of 50 apples and pears (apples + pears) in a large basket. If the total number of apples was doubled and the total number of pears was tripled, these two numbers would add up to 130. How many apples and pears are in the basket?
Sketch the graph of x^2 + 4x + 3
Draw y=x^2+5
1. factorise x^2 - 9 Level 6 KS3, 2. Rearrange a (q-c) = d to make q the subject