Final answer:
None of the simplified expressions perfectly match the listed options A, B, C, or D, except for the last one, which accurately corresponds to expression D (3x² + 5x - 7). Typos or mistakes in provided expressions might be a reason for mismatches in the other comparisons.
Step-by-step explanation:
First, we need to simplify the given expressions to determine which letter corresponds to the equivalent form from the list provided. Let's work through each one:
- (4x³ + 7x) - (2x³ + 8) simplifies to 2x³ - 1, which does not correspond to any of the given expressions A, B, C, or D.
- (-3x² + x + x) + (2x - 7 + 4x) simplifies to -3x² + 7x - 7, which is equivalent to expression D, with a different arrangement of terms.
- (2x) (2x + 3) simplifies to 4x² + 6x, which is not equivalent to any of the expressions A, B, C, or D listed.
- 3x² + 5x - 7 is identical to the original expression D.
If we consider typographical errors and look at the content within the context, none of the simplified expressions perfectly match the options provided (A, B, C, D), except for the final one (3x² + 5x - 7), which matches expression D. For the expressions that do not match, perhaps an error has been made either in the expressions provided in the question or in the options A, B, C, D. It is important to double-check the original expressions and their corresponding options for accuracy.
Working with algebra requires attention to detail, particularly when simplifying and manipulating expressions to find equivalent forms. For accurate problem-solving, one must ensure that all variables and constants are correctly accounted for during simplification.