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Evaluate x^2 +2x -4 = 0

Using the quadratic formula (-b +- sqrt(b^2 -4ac))/2a we can sub substitute a = 1, b=2 and c = -4 to solve. The answer is x = -1 +/- sqrt(5)
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Answered by Adeolu C. • Maths tutor
4237 Views

Translate the following Facebook post: "Il y a un centre commercial dans ma ville. Le samedi j’aime faire les magasins avec ma copine. Récemment j’ai acheté un nouveau portable. C’était trop cher. Je ne sais pas si on va sortir la semaine prochaine."

Il y a un centre commercial dans ma ville - There is a shopping centre in my town Le samedi j'aime faire les magasins avec ma copine - On saturdays (recurrent) , I like to do the shops/go shopping with my fr...
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Answered by Clarisse S. • French tutor
5202 Views

A straight line L1 has equation y = 2x + 4. L2 is parallel to L1 and passes through the point (3,13). What is the equation of L2?

Firstly, If L2 is parallel to L1, the gradient of L1 = L2 . If we then take the generic equation of any straight line to be: y = mx + c, the m (gradient) of any two parallel lines will be equal! So even befo...
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Answered by Harvey P. • Maths tutor
16233 Views

What is an ALU?

The ALU, or Arithmetic Logic Unit, is a section of the CPU (Central Processing Unit) dedicated to working with Arithmetic and Logic... It can process a variety of mini-tasks (operations) and is used in conju...
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Answered by Tobi A. • Computing tutor
6672 Views

Describe the structure and bonding in diamond.

Answer: Diamond is organised in a giant lattice structure with strong covalent bonds between carbon atoms. Each carbon atom forms 4 bonds. Explanation: Each carbon atom has four electrons in its outer shell,...
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Answered by Anuska R. • Chemistry tutor
61491 Views