Question

Help with simple arithmetic.

Answer 1

How does \[3(1-\sqrt{1+t})(1+\sqrt{1+t}) = -3t\] equal -3t? Show how please.

Answer 2

My arithmetic is a bit fuzzy in this area. Need a refresher.

Answer 3

:=)

Answer 4

\[\huge\rm 3 \color{blue}{(1-\sqrt{1+t})(1+\sqrt{1+t})} = -3t\] hint: \[\huge\rm (a+b)(a-b)=a^2-b^2\] apply this rule for both parentheses (blue part)

Answer 5

ahh i see wait a sec hmm

Answer 6

oh yeah nvm
make sense ?

Answer 7

that's what i did first :P but yea remember we should distribute parentheses by negative one and then cancel out 1