Vectors a and b are defined by a = 2i + 3j and b = 4i - 2j, find 3a-b in terms of i and j
3a = 6i + 9j
-b = -4i + 2j
3a-b = (6i-4i) + (9j+2j) = 2i + 11j
PM
Related Maths GCSE answers
All answers ▸Solve the equation 3a^2+4a+1=3 for all values of a. Give your answers to 3 significant figures.
White paint costs £2.80 per litre. Blue paint costs £3.50 per litre. White paint and blue paint are mixed in the ratio 3 : 2. Work out the cost of 18 litres of the mixture.
Write (9^8)/((9^5)^2) in its simplest form
There are n sweets in a bag. 6 of the sweets are orange. The rest of the sweets are yellow. Hannah takes a sweet from the bag and eats it. Hannah then takes at another sweet. The probability that Hannah eats two orange sweets is 1/3. Show that n²-n-90=0