Fill in the blanks to make the given expression a perfect square: 25a² + 16b² + __
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25a² + 16b² + 40ab
@Step-by-step explanation:
25a² = (5a)²
16b² = (4b)²
@By using formula
(a+b)² = a² + b² + 2ab
@put value on equation
(5a+4b)² = (5a)² + (4b)² + 2ab
@find value of 2ab
now, 2 × 5a × 4b
= 40ab
@Final answer is 25a² + 16b² + 40ab
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