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How do I solve a quadratic equation by competing the square?

How would you solve  x2+8x+16=81Show that this can be factorised (x+4)2=9

Answered by Maths tutor
3002 Views

how do you calculate the charge of a neuclues compared to an ion?

With an neucleus, the charge is calculated by using the formula: number of protons x the charge of a single electron with an ion, the charge is calculated using the formula:number of extra charge x charge...

KQ
Answered by Kulsoom Q. Physics tutor
1511 Views

Can one know whether one has hands?


Initially one might argue that one cannot know one has hands, because any past experience of hands could merely be a dream about hands. After all, and as Descartes suggested, dreams often feel real...

JM
Answered by Joseph M. Philosophy tutor
2800 Views

What is the function of mitochondria?

Mitochondria is an organelle responsible for providing energy. Mitochondria releases energy through the chemical process of aerobic cellular respiration, where one molecule of glucose can be broken down (...

NF
Answered by Natalia F. Biology tutor
8459 Views

Who is a refugee?

Why is a refugees different from other migrants? The first definition of who is a refugee was provided by the the Refugee Convention, signed in Geneva in 1951. Nowadays that definition is still working; c...

LP
Answered by Laura P. Law tutor
1542 Views

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