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How do I know when to use sine, cos or tan when working with right angled triangles?

When dealing with right angled triangles, you just need to remember 'SOHCAHTOA'. If you struggle to remember this, you may find it easier to recall:' S ome O f H er C hildren A re H aving T rouble O ver A lg...
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Answered by Jonny G. • Maths tutor
3046 Views

Plot the graph for y = 4x - 3

Create a table for x and y x,1,2,3y,1,5,9Draw the line on a graph
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Answered by Conor S. • Maths tutor
3803 Views

Draw the graph of y=x^2-4x-21

We know that this is going to be a “U” shaped parabola as the graph is a positive x^2 graph. The y intercept is the point at which x=0. Substituting in 0 gives when x = 0, y = -21.Now we need the x intercept...
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Answered by Tutor598463 D. • Maths tutor
4434 Views

Show that the function f(x) = x^2 + 2x + 2 is always positive for real values of x

By completing the square we find that f(x) = x 2 + 2x + 2 = (x+1) 2 + 1Since (x+1) 2 is a number that has been squared, it must be greater than or equal to zero. Therefore, f(x) = (x+1) 2 + 1 must be greater...
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Answered by Bradley C. • Maths tutor
7922 Views

Draw the graph y = x2 + 3x + 2

y = x 2 + 3x + 2 Finding the y intercept:When x = 0, y = 2 Therefore y intercept is at (0,2)Finding x intercept:Method 1: Factorise y = x 2 + 3x + 2 y = (x+1)(x+2)x intercepts are when y = 0 , therefore find...
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Answered by George R. • Maths tutor
4268 Views