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 ▸Write x/(x-1) - x/(x+1) as a single fraction in its simplest form (Edexcel GCSE 2016)
What is Standard form? And when can I use it?
The sides of a rectangle are x and (x+2), where x>0 the area of the rectangle is 8, what is the value of x?
a)By completing the square, prove the quadratic formula starting from ax^2+bx+c=0, b) hence, or otherwise solve 3x^2 + 7x -2= 9, to 3s.f.