Question

(4x+9y)(4x+9y) find the product​

Answer 1

Answer:

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Step-by-step explanation:

(a + b)(a - b) = a² - b²

Therefore, (4x+9y)(4x+9y) = (4x)² - (9y)² = 16x² - 81y²

Answer 2

Step-by-step explanation:

(4x+9y)²

(4x)²+(9y)²-2(4x)(9y). {(a+b)²= a²+b²-2ab}

16x²+81y²-72xy