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How do you complete a square

If you are given the equation y = x 2 +4x+1 First you determine what is in the squareMake sure your x 2 term has no coefficientFind half the coefficient of the x termThat is your bracket term in this case - ...
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Answered by Joshua R. • Maths tutor
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Name and describe the function of the different organelles within a cell, and compare the differences within a plant and an animal cell.

Nucleus- controls cell's activity. DNA transcription occurs here. Stores DNA (genetic material).Cytoplasm- some cell reactions occur here. Fluid-Jelly-like environment. Glycolysis occurs here.Mitochondria-si...
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Answered by Anaelle T. • Biology tutor
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show that f(x)=cos(x) is even and what is its graphical property

If the function is even, f(x) = f(-x).cos(-x) is the same value as cos(+x) therefore the function is even. Its graphical property is that it is symmetrical about the y axis as all even functions are.
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Answered by Matthew P. • Maths tutor
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find the roots of the equation 7x^2+11x-2=0 in exact form

since the values are too difficult to calculate from factorising, we use the quadratic formula ((-b)±(b^2-4ac)^(1/2))/(2a).putting the values in as (ax^2+bx+c=0) we find the roots in exact form are;(-11+(177...
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Answered by Matthew P. • Maths tutor
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What is Wallerstein's World Systems theory?

We can traditionally consider three core models which theorise how the development gap has come to exist. These are: Dependency Theory, Rostow's Modernisation Theory, and Wallerstein's World Systems Theory. ...
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