Work out the value of 2a^2 + b^3 when a = 5 and b = –3
It is best to approach this question in parts, then combine the parts to find your solution. This question may be split into parts, as follows: Firstly, if a = 5, then a2 = 52 = 5 x 5 = 25. So a2 = 25 Secondly, if b = -3, then b3 = (-3)3 = (-3) x (-3) x (-3) = 9 x (-3) = -27. So b3 = -27 Finally we can combine the above parts: 2a2 + b3 = 2(25) + (-27) = 2 x 25 - 27 = 50 - 27 = 23 So the value of 2a2 + b3 is 23.
TD
Related Maths GCSE answers
All answers ▸Solve 3(x-2)=21
At a football game number of men : number of women : number of children = 13 : 5 : 7 There are 4152 more men than women. Work out the number of children at the game.
y is inversely proportional to d^2. When d = 10, y = 4. d is directly proportional to x^2. When x = 2, d = 24. Find a formula for y in terms of x. Give your answer in its simplest form.
Anouk, Beth and Carlin share £48 between them. Beth gets 3/8 of the money. Anouk and Carlin share the remaining money between them, by the ratio 3:2. How much money does Carlin get?