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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. b²-4ac = 4-(4 x -3) = 4+12 = 16, which is greater than 0, so we're fine.
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Answered by George M. • Maths tutor

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How should I structure a philosophy essay?

The most important thing is to have an argument running through your whole paper and to be very clear throughout what the overall conclusion you are aiming at is. A good idea, especially in shorter papers...

Answered by • Philosophy tutor

1015 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

Answered by William G. • Maths tutor

2532 Views

Describe action potential and how it allows for signals to be transmitted along neurons.

To answer this question, we first need to understand what a neuron is and what its components are. A neuron is a nerve cell that transmits electrical impulses between cells to continue an action, to end a...

Answered by Oliver M. • Biology tutor

2126 Views

Is it acceptable to run a red light if you know there is no risk of harm to anyone?

This question does not necessarily have an answer as it is designed to assess the capacity of the student to think and demonstrate use of reason and logic. An appropriate answer would consider the various...

Answered by Abu-Bakr S. • Oxbridge Preparation tutor

1233 Views