Question

factor trinomial by grouping
r^2-3rs-40s^2

Answer 1

\[r^2-3rs-40s^2\]
\[r^2-2\frac{3}{2}rs+\frac{9}{4}s^2-\frac{9}{4}s^2-40s^2\]
\[(r-\frac{3s}{2})^2-\frac{169}{4}s^2\]
\[(r-\frac{3s}{2}+\frac{13}{2}s)(r-\frac{3s}{2}-\frac{13}{2}s)\]
\[(r+\frac{10s}{2})(r-\frac{16s}{2})\]

Answer 2

wow, thanks so much

Answer 3

you're welcome!