hernsl0263
11.10.2020 •
Mathematics
(9x-9)(9×+9), your finding the difference between two squares. im have some trouble in how to solve it.
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Ответ:
81x² - 81
Step-by-step explanation:
Step 1: Write expression
(9x - 9)(9x + 9)
Step 2: Expand by FOIL
81x² + 81x - 81x - 81
Step 3: Combine like terms
81x² - 81
Ответ:
x_1= -1 or x_2= -6
Step-by-step explanation:
In the pictures