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(2x-5)(3x+2)(x+7) - Expand the brackets.

(6x^2+4x-15x-10)(x+7)(6x^2 -11x-10)(x+7)= 6x^3-11x^2-10x+42x^2-77x-70)=6x^3+31x^2-87x-70
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Answered by Gloria A. • Maths tutor
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What is the determinant of a 2 by 2 matrix?

Let A by any 2 by 2 matrix and the top left, top right, bottom left and bottom right entries be a, b, c and d respectively. The determinant for matrix A would be ad-bc.
LG
Answered by Lin G. • Maths tutor
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Person A, weighing 35 kg, is sitting 10m away from a seesaw pivot. Person B, weighing 50 kg, it sitting at the other end, at a distance d. Calculate d, in order for the seesaw not to topple over. (g=10m/s^2)

Force@A: F A = m A x g = 35 x 10 = 350NAnticlockwise moment: M A = F A x d A = 350 x 10 = 3500NmForce @B: F B =m b x g = 50 x 10 = 500NClockwise moment: M c = F B x d B For the seesaw to be in equilibrium, M...
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Answered by Antonia A. • Physics tutor
2577 Views

How can I improve my French accent?

EXPOSURE! Listen to French radio (there are plenty of apps for that).Watch French films - if you struggle with comprehension, stick on the French subtitles. If that's still to difficult, turn on the English ...
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Answered by Ellen D. • French tutor
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Briefly evaluate the biological approach in Psychology. (6 marks - AQA style)

One strength of the biological approach is that it has real-life application. For example, a modern understanding of biochemical processes within the brain has led to the development of psychoactive drugs wh...
JH
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