Answer:To complete the polynomial grid correctly, you should place each term exactly once, using the values provided at the top and on the left. Begin by assigning the given value of x at the start. Then, fill in the empty boxes with the terms 3x², 7x, 5x, 3x, 10, and 8 such that the products or sums align with the final calculated values at the end of each row and column. This systematic placement ensures that each term contributes appropriately to form a consistent polynomial expression both vertically and horizontally, satisfying all given conditions.Step-by-step explanation: