paight
paight
28-02-2017
Mathematics
contestada
(9x-8)(9x+8) answer ??
Respuesta :
zexius
zexius
28-02-2017
(9x - 8)(9x + 8)
9x × 9x = 81x²
9x × 8 = 72x
-8 × 9x = -72x
-8 × 8 = -64
= 81x² + 72x - 72x - 64
The 72x cancels out, so you're left with 81x² - 64.
The answer is 81x² - 64.
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