# For all x, (3x + 7)² = ? A. 6x + 14 B. 6x² + 14 C. 9x² + 49 D. 9x² + 21x + 49 E. 9x² + 42x + 49 Can anyone explain how to make it step by step?

###### Question:

For all x, (3x + 7)² = ?
A. 6x + 14
B. 6x² + 14
C. 9x² + 49
D. 9x² + 21x + 49
E. 9x² + 42x + 49
Can anyone explain how to make it step by step?

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