(– 20) × ( 5 – 3) = (– 20) × ( – 2)
If 2a + 3b = 8 then express 3b2–2b+3 in terms of a.
Find the 20th term in the binomial expansion of (1+x)20 when x=−5
3m+2(m+2)=20-(2m-5)
In the second step- 3m+2m+4=20- 2m+5, how did 20-(2m-5) become 20-2m+5