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We know that angles on a straight line add to 180 degrees. Now imagine you have a triangle and the angles are called A, B and C. 

We can orientate the triangles so that we form a straight line. We ...

Using the substitutions a=2, b=7 and c=11 with the quadratic formula we get two values of x at 3.39 and 0.89.

= pi * r^2

=pi * 1.5^2

=pi * 1.5 * 1.5

=7.07 cm^2

X = -2

Y = 5

Common exam question: fully expand and simplify (x+3)(x-2)

Student asks: how should I best answer the question? How do I do it step by step?

My answer:
First expand each individual par...