Solve "x^2 - 12x - 45 = 0" by completing the square
The equation is of the formx2+bx+c=0This means it can be rearranged to(x+(b/2))2=(b/2)2-cTaking the square root of both sides leaves us with x.
x2-12x-45=0(x-(12/2))2-(12/2)2-45 = 0(x-6)2-62-45 = 0(x-6)2 = 45 + 36(x-6)2 = 81x-6 = 9x= 6 + 9 = 15
EJ
Related Maths GCSE answers
All answers ▸what is the largest stick can you fit into a cylinder, if the radius is 3cm and the length is 24cm. To 2d.p
Work out 60% of 70
An ordinary, fair sided dice is rolled 480 times. How many times is the number 3 expected?
At a football game number of men : number of women : number of children = 13 : 5 : 7 There are 4152 more men than women. Work out the number of children at the game.