Solve the equation x^2 - 8x + 5 = 0 by completing the square
x2 - 8x + 5 = 0 => (x2 - 8x + 16) - 11 = 0 =>(x - 4)2 = 11 =>x - 4 = +- sqrt(11) =>x = 4 +- sqrt(11)
DH
Related Maths GCSE answers
All answers ▸How do I rewrite algebraic fractions as a single fraction?
The straight line L1 passes through the points with coordinates (4, 6) and (12, 2) . The straight line L2 passes through the origin and has a gradient of -3. The lines L1 and L2 intersect at point P. Find the coordinates of P.
A bag contains 5 blue marbles and 5 red marbles. If marbles are NOT replaced after being selected from the bag, what is the probability (in percentage) of picking 2 red marbles? Give your answer to one decimal place.
The perimeter of a right-angled triangle is 60 cm. The lengths of its sides are in the ratio 3 : 4 : 5. Calculate the area of the triangle.