Quadratic formula — Algebra I · Grade 9 or accelerated Grade 8, what it means and where it is taught
x = -b ± √b2 - 4ac2a.
Taught in Algebra I · Grade 9 or accelerated Grade 8.
Where it is taught
Practise this idea
1 question in the course bank use Quadratic formula, in Solving Quadratic Equations.
Problem 1
Solve x2 + 4x - 5 = 0 using the quadratic formula.
Worked answer
1 and -5
b2 - 4ac = 16 + 20 = 36
x = -4 ± 62
x = 1 or x = -5