No. You can only add variables that have the same exponents. Also, during addition of variables with the exponent, you do not add the exponents.
X^2-14+5 I’m not sure though
Formula to convert F to C:
(F -32) x 5/9
F = 63 + 10 = 73
73-32 = 41
41 x 5/9 = 22.77777
Rounded to the nearest degree = 23 C