Expand (2x-1)(x+3)
Method 1: Foil method (each term of the first bracket are multiplied by each term of the second bracket, and hence the product have 4 terms before simplifying)(2x-1)(x+3) = 2xx + 2x3 - 1x -13 =2x2 + 6x - x -3 = 2x2 + 5x - 3(* denotes multiply)Method 2: Grid method (the horizontal terms are multiplied with the vertical terms, i.e.: 2x x, -13)* 2x -1x 2x2 -x3 6x -3 Adding the 4 product terms together, we get: 2x2 - x + 6x -3 = 2x2 + 5x - 3
CN
Related Maths GCSE answers
All answers ▸Frank owns an ice cream van. When he bought the van five years ago and an ice cream cost £1.50. If the price of an ice cream increases by 3% a year how much does an ice cream cost now?
How do you factorise a quadratic with a co-efficient in front of the x^2 - e.g: 3x^2 + 14x + 8
In a competition, a prize is won every 2014 seconds. Work out an estimate for the number of prizes won in 24 hours. You must show your working. (4 marks)
Solving quadratic equations using the factorisation method.