Top answers

f(x) = x^2 + 2x - 3. Where does the graph of the function f intersect the x-axis?

First, let's use the discriminant to check that the function actually does intersect the x-axis. b 2 -4ac = 4-(4 x -3) = 4+12 = 16, which is greater than 0, so we're fine. The function intersects the x-axis ...
GM
Answered by George M. • Maths tutor
3881 Views

James buys a new car for £1000. Every year the value of the car decreases by 3%. If James bought the car in 2017 what would the value of the car be in 2021?

First work out how many years have passed since the car was bought. 2017-2021 is 4 years. Write an expression for the cost of the car after n years. Cost = 1000 * 0.97 n . Write down an expression for the co...
WG
Answered by William G. • Maths tutor
3386 Views

(Textiles) What are the 3 key fibre classifications? Give an example for each category.

Natural fibres, eg. Cotton Manufactured (regenerated) fibres, eg. Viscose Synthetic fibres, eg. Polyester
2561 Views

What are the verb endings for regular -ar verbs in the present tense?

-o-as -a -amos -áis-an
Answered by • Spanish tutor
2085 Views

How do you expand brackets?

Take the expression(x+2)(x+4). Expanding brackets essentially means multiplying them out to get a new expression. In this case, it will have the form x 2 +cx+d, where c and d are numbers to be determined. Th...
JA
Answered by Jan A. • Maths tutor
5410 Views