Answer:
16x² + 56x + 49
Step-by-step explanation:
First, expand:
(4x + 7)² = (4x + 7)(4x + 7)
Follow the FOIL method. FOIL = First, Outside, Inside, Last.
(4x)(4x) = 16x²
(4x)(7) = 28x
(7)(4x) = 28x
(7)(7) = 49
16x² + 28x + 28x + 49
Combine like terms:
16x² + (28x + 28x) + 49
16x² + (56x) + 49
16x² + 56x + 49 is your answer.
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