Question

49(r-4)^2+70(r-4)+25 = ?????????

Answer 1

\[49 (r-4)^2+70 (r-4)+25=(7 r-23)^2 \]

Answer 2

No .. look at this ..

let \[\left( r-2 \right) = x\]

then we have :

\[49x ^{2}+70x+25\]
\[=\left( 7x+5 \right)^{2}\]
\[=\left[ 7\left( r-2 \right)+5 \right]^{2}\]

Answer 3

@ Abdullah Al-Hagbani

Your "let" expression is incorrect for this problem. It should have been:

let
(r-4) = 2