Solve x^2+6x+5=0
Use factorisation to solve this. You must find a pair of numbers that add to make 6 and multiply to make 5. In this question, 5 and 1 add to make 6 and they also multiply to make 5. So the factorised equation here is (x+5)(x+1)=0. By setting each bracket to be 0, we can see that x can be equal to -5 (when (x=1)=0, x+5=0 so x=-5) or -1 (when (x=5)=0, x+1=0 so x=-1)
CL
Related Maths GCSE answers
All answers ▸Mark wants to borrow money to buy a car. His bank offers him a loan of £5,000 to be payed back over 3 years at 4% compound interest. a) Work out the interest acquired in the 2nd year. b) In total how much will Mark end up paying back the bank?
Write y = x^2 + 4x + 6 in the form y = (x + a)^2 + b. What is the minimum value of y?
A is the point (2,-5), B is the point (-1,4). (a) What is the gradient of the line passing through points A and B? (b) Does the point (-100,301) lie on the line passing through points A and B?
Factorize x^2-x-20