(2x + 5)²
= (2x)² + 2(2x)(5) + 5²
= 4x² + (4x)(5) + 25
= 4x² + 20x + 25
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(2x + 5)²
= (2x)² + 2(2x)(5) + 5²
= 4x² + (4x)(5) + 25
= 4x² + 20x + 25
= (2x)² + (2x . 5 . 2) + (5²)
= 4x² + 20x + 25
ATAU
(2x + 5)²
= (2x + 5) (2x + 5)
= (2x . 2x) + (2x . 5) +(5 . 2x) + (5 . 5)
= 4x² + 10x + 10x + 25
= 4x² + 20x + 25