Using the quadratic equation, solve 3x^2+2x-15 to two decimal places.
The quadratic equation is x=(-b+-SQRT(b^2-4ac))/2a. In this instance, a = 3, b = 2, and c = 15. Simply putting the numbers in place of the letter counterpart, gives an answer of 1.93 and -2.59 to two decimal places.
CF
Related Maths GCSE answers
All answers ▸How do you factorise x^2 +5x+6?
Express 216 as a product of its prime factors.
Given that your grade for your computing is based on 5 coursework that weigh differently, and you know the results of 4: 80, 75, 50 and 90 which weighs 10%, 20%, 45% and 5%. What grade do you need in your last coursework to achieve at least a B (70%)?
Solve this pair of simultaneous equations: 3x + y= 7 and 3x - y = 5