Solve by completing the square: x^2 - 8x + 12 = 0
x2 - 8x + 12 = 0 (x - 4)2 - 16 + 12 = 0 (x - 4)2 - 4 = 0 (x - 4)2 = 4 x - 4 = +- 2 x = 6 x = 2
JV
Related Maths GCSE answers
All answers ▸The circle c has equation x^2+ y^2 = 1. The line l has gradient 3 and intercepts the y axis at the point (0, 1). c and l intersect at two points. Find the co-ordinates of these points.
A rectangle has an area of 20 cm2. Its length and width are enlarged by scale factor 3. Find the area of the enlarged rectangle.
A class of 10 students all complete a maths exam. Their marks are as follows: 67, 82, 48, 36, 55, 95, 19, 49, 62 and 73. Find the mean, median and range.
A box contains 7 caramel doughnuts. They have masses of 56 g, 67 g, 45 g, 56 g, 58 g, 49 g and 50 g. Find the median, mean and mode values of these masses. Bonus: What mass of doughnut could be added to the box to make the mean mass = 61 g.