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2+2 is 4, minus 1, that's what?

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Answered by Joe F. • Maths tutor

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How to find the angle between two 3-dimensional vectors:

The quadratic equation 2x^2 + 8x + 1 = 0 has roots x1 and x2. Write down the value of x1+x2 and x1*x2 and find the value of x1^2 + x2^2

I did all the past papers but I still only achieved a C grade, what am I doing wrong?

Find the vertex coordinates of parabola y = 2x^2 - 4x + 1

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