Question

81x² - 25y² + 16z² + 72xz find the value using identities....

Answer 1

Answer:

81x² - 25y²

(9x)² - (5y) ²

9x - 5y is the answer in your question

or

(9x)^-(5x)^=(9x-5x) (9x+5x)

Step-by-step explanation:

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Answer 2

(81x^2 +72xz +16z^2) -25y^2( (a+b) ^2=a^2+2ab+b^2)

(9x+4z) (9x+4z) -25y^2

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