It means your solving for x
Answer:
one solution it is x=1
Step-by-step explanation:
i can type in the steps if you want
I suppose its 7, subtracted
28.7083333333...
But you could also round it up to 29.
Answer: 25x² - 64
<u>Step-by-step explanation:</u>
(5x + 8)(5x - 8)
= 5x(5x - 8) + 8(5x - 8)
= 25x² - 40x + 40x - 64
= 25x² + 0x - 64
= 
NOTE: descending powers means the biggest exponent goes first, then the next biggest exponent, etc.
For example: x⁴ then x³ then x² then x then the number (which is actually x⁰)