What if my equation doesn't factorise?
For all quadratic equations, you can use the quadratic formula. Given an equation of the form ax2+bx+c, you can plug those values into this formula:x1, x2 = (-b +/- sqrt(b2 - 4ac)) / 2aNote: the term b2 - 4ac is called the determinant and must be greater than 0 for your equation to have any solutions.
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Related Maths GCSE answers
All answers ▸Completing the Square
Simplify √90+√360+5√10
Given a spinner divided in 3 sections numbered 1, 2 and 3, and that the arc of section 2 is double that of section one (~57.6 cm), calculate pi to 2 decimal places. The radius of the spinner is 30cm and the angle sub-intended by section 3 is 30 degrees.
A car depreciates at 8% per year. The initial price of the car is £25,000. How much will the car be worth after 4 years? After how many years will the car be worth less than £14,000?