How do I do the dot product with vectors?
You multiply the terms of each vector that have the same unit vector (e.g. i, j, k). For example, you multiply the i terms in the first vector by the i terms in the second vector. When you've multiplied them the answer will be a scalar (it doesn't have any vector terms like i, j, k).
PC
Related Maths GCSE answers
All answers ▸Katie buys: 3 pens costing £2.20 each, 1 rubber costing £1.60 and 2 pencils. She pays with a £10 note and a £2 coin. She gets 20p change. What was the price of each pencil?
Billy wants to buy 10kg of the same oranges. Type A comes in bags of 1.25 kg and costs £1.50. Type B comes in bags of 5kg and used to cost £6.60 but are now 15% off. Which type is more worth it for Billy and how much does it cost?
Make x the subject of the formula: 3x - 2 = y + 10
If two linear equations, y = x + 4 and y = 2x + c, intersect at x = 1, find c.