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 ▸Integrate 2x^5 + 7x^3 - (3/x^2)
Prove that 1+2+...+n = n(n+1)/2 for all integers n>0. (Hint: Use induction.)
show that f(x)=cos(x) is even and what is its graphical property
f(x)= 2x^3 -7x^2 + 2x +3. Given that (x-3) is a factor of f(x), express f(x) in a fully factorised form.