How to expand squared brackets?
Take, for example, the bracket (a+5)^2. The longer way to do it would be to write (a+5)^2 as (a+5)(a+5) and multiply out that way. However, there is a shorter way where all you have to do is square the first term, square the last term and multiply their product by 2. Therefore, (a+5)^2= a^2 + 10a + 25
DC
Related Maths A Level answers
All answers ▸Show that the determinant of the 3x3 matrix (2 1 1 / 2 1 7 / 6 3 5) is equal to zero.
Given that f(x)= (3+x^2)(x^1/2-7x). Find f'(x) (5marks)
Find the equation of the straight line perpendicular to 3x+5y+6=0 that passes through (3,4)
A stationary point of inflection implies a second derivative of 0, does this work the other way around?