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13-05-2016
Mathematics

contestada

Choose the correct product of (9x − 5)(9x + 5).
81x2 + 90x + 25
81x2 − 25
81x2 + 25
81x2 − 90x + 25

Respuesta :

13-05-2016

Hi,
(a+b)(a-b=a²-b²
Thus (9x)²-5²=81x²-25

Answer Link

04-03-2019

Answer:

The Answer is B

Step-by-step explanation:

(9x−5)(9x+5)

=(9x+−5)(9x+5)

=(9x)(9x)+(9x)(5)+(−5)(9x)+(−5)(5)

=81x2+45x−45x−25

=81x2−25

Answer Link

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