$$49 a ^ { 2 } - 2 a b + \frac { b ^ { 2 } } { 49 }$$
$\frac{\left(49a-b\right)^{2}}{49}$
$$\frac{49\left(49a^{2}-2ab\right)}{49}+\frac{b^{2}}{49}$$
$$\frac{49\left(49a^{2}-2ab\right)+b^{2}}{49}$$
$$\frac{2401a^{2}-98ab+b^{2}}{49}$$
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$$\left(49a-b\right)^{2}$$
$$\frac{\left(49a-b\right)^{2}}{49}$$
