<u>Sum of Cubes:</u>
a³ + b³ = (a + b)(a² - ab + b²)
Example: x³ + 8 → a=x, b=2
= (x + 2)(x² - 2x + 4)
<u>Difference of Cubes:</u>
a³ - b³ = (a - b)(a² + ab + b²)
Example: x³ - 27 → a=x, b=3
= (x - 3)(x² + 3x + 9)
<u>Difference of Squares:</u>
a² - b² = (a - b)(a + b)
Example: x² - 16 → a=x, b=4
= (x - 4)(x + 4)
X is equal to -17.85
Hope this helped☺☺
Answer:
100
Step-by-step explanation:
You multiply 125 by 0.80. This is because 125 is the original amount nd to find out how much you have to pay, you would subtract 20% from 100% to get 80%. Now, you know that you have to pay for 80% of the stereo. In order to multiply the two numbers together, you have to convert 80% to a decimal which is 0.80. Lastly, you multiply to get 1oo. Therefore, the stereo costs $100.00 during the sale.
