Question

Fill in the blanks to make the given expression a perfect square: 25a² + 16b² + __

Answer 1

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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