Solve the quadratic equation x^2 + 3x + 2 = 0, by factorisation.
We need two numbers, a and b, such that a*b = 2 and a+b=3Looking at the equation it can be seen that 2 and 1 fulfill these conditions.Therefore x2 +3x +2=0 = (x+2)(x+1)=0This means we need either x+2 or x+1 to equal 0 x+2=0 so x= -2 or x+1=0 so x= -1Therefore x= (-1 , -2)
SS
Related Maths GCSE answers
All answers ▸Find an equation of the line which passes through the point (4,-7) and has slope 3.
How do you work out the surface area of a cylinder?
40 students were surveyed: 20 have visited France 15 have visited Spain 10 have visited both France and Spain. Use this information to complete a Venn Diagram
The probability that it rains on a given day is 0.15. The probability that a football match is cancelled when it rains is 0.65. If it doesn't rain, the probability that the match is not cancelled is 0.95. What is the chance that the match is cancelled?