p(x) = coeffs[n-1] + coeffs[n-2] * x + ... + coeffs[0] * x**(n-1)

# importing the library
import tensorflow as tf
  
# Initializing the input tensor
coeffs = [-1, 2, 3]
x = tf.constant([7], dtype = tf.int32)
  
# Printing the input tensor
print('coeffs: ', coeffs)
print('x: ', x)
  
# Calculating Result
res = tf.math.polyval(coeffs, x)
  
# Printing the result
print('Result: ', res)

coeffs:  [-1, 2, 3]
x:  tf.Tensor([7], shape=(1, ), dtype=int32)
Result:  tf.Tensor([-32], shape=(1, ), dtype=int32)

# importing the library
import tensorflow as tf
  
# Initializing the input tensor
coeffs = [-1, 2, 3]
x = tf.constant([7, 2], dtype = tf.int32)
  
# Printing the input tensor
print('coeffs: ', coeffs)
print('x: ', x)
  
# Calculating Result
res = tf.math.polyval(coeffs, x)
  
# Printing the result
print('Result: ', res)

coeffs:  [-1, 2, 3]
x:  tf.Tensor([7 2], shape=(2, ), dtype=int32)
Result:  tf.Tensor([-32   3], shape=(2, ), dtype=int32)