\(\huge\text{Hey there!}\)
\(\large\textsf{If d = 3, then SUBSTITUTE it into the given equation}\)
\(\large\textsf{7(3)}\mathsf{^2}\large\textsf{+ 1}\)
\(\large\textsf{3}\mathsf{^2}\)
\(\large\textsf{= 3 }\mathsf{\times} \large\textsf{ 3}\)
\(\huge\textsf{= \bf 9}\)
=\(\large\text{New EQUATION: }\large\textsf{ 7(9) + 10}\)
\(\large\textsf{7(9) = \huge\bf 63}\)
\(\large\textsf{= 63 + 10}\)
\(\large\textsf{= \huge \bf 73}\)
\(\boxed{\boxed{\large\textsf{Answer: \huge \bf 73}}}\huge\checkmark\)
\(\large\text{Good luck on your assignment and enjoy your day!}\)
~\(\frak{Amphitrite1040:)}\)
