How do I find the roots of a quadratic?
e.g. given x^2 +3x -8 = 0using the quadratic formulayou find x = (-b +- sqrt(b^2 -4ac))/2ayou then find one root using the plus instead of plus minus sign, and the other root using the minus instead of plus minus sign.
TD
Related Maths GCSE answers
All answers ▸The point (-3, -4) is the turning point of the graph of y = x^2 + ax + b, where a and b are integers. Find the values of a and b.
What can I say about the roots of a quadratic equation without actually calculating them?
(2x + 3y)^2 – (2x – 3y)^2 = 360 show that xy is a multiple of 5
How do I solve simultaneous equations by substitution?