Mathematics for IGCSE & O level - Equations (Section 6 - No. 38)
If an equation is in the form ax² + bx + c = 0 and you solve it using the quadratic formula, which of the following represents the solution?
x = (-b ± √(b² - 4ac)) / 2a
x = (b ± √(b² - 4ac)) / 2a
x = (-b ± √(b² + 4ac)) / 2a
x = (b ± √(b² + 4ac)) / 2a
คำอธิบาย
The quadratic formula is: x = (-b ± √(b² - 4ac)) / 2a