Expand and simplify 2(a + 3) + 5(a – 1)
Firstly we will start by expanding the brackets. We will do 2a + 23 for the first bracket, then we will do 5a + 5(-1) for the second bracket which will give us 2a + 6 + 5a - 5. We will then simplify what we have. In order to collect terms and simplify, they must be of the same 'type' ie numbers on their own without letters can be collected and numbers that have been multiplied by a letter can be collected as long as they have the same letter. We can now collect the terms as such 2a + 5a + 6 - 5 This will then give us 7a + 1
SB
Related Maths GCSE answers
All answers ▸One of the teachers at a school is chosen at random. The probability that this teacher is female is 3/5 There are 36 male teachers at the school. Work out the total number of teachers at the school.
(ii) In 90 days, the gas used by a family cost $198.16 . Calculate the number of units of gas used.
What should I do if I can’t answer this question?
A cuboid of height 5 cm has a base of side 'a' cm. The longest diagonal of the cuboid is 'L' cm. Show that 'a' = SQRT[ (L^2 - 25)/2]