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Olegator [25]
2 years ago
9

Multiply the polynomials. (3x − 9)(5x + 1)

Mathematics
2 answers:
Murljashka [212]2 years ago
7 0
(3x − 9)(5x + 1)
3x * 5x
3x * 1
-9 * 5x
-9 * 1

15x^2 + 3x - 45x - 9
15x^2 - 42x - 9
Scilla [17]2 years ago
3 0
1 5 x ² - 4 2 x - 9

Ther

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Answer in scientific notation?
love history [14]
The answer is:  45 * 10 ⁻¹¹ .
___________________________________________

Explanation:
____________________________________________
Given:   (9 * 10⁻⁵) * (5 *10 ⁻⁶) ;   Simplify.
____________________________________________
 (9 * 10⁻⁵) * (5 *10⁻⁶)  =

9 * 5 * 10⁻⁵ * 10⁻⁶ = 

(9 * 5) * 10⁻⁵ * 10⁻⁶ 

45 * 10⁻⁵ * 10⁻⁶  ;   
______________________________________
Note the following property of exponents:

xᵃ * xᵇ = x⁽ᵃ⁺ᵇ⁾ ;

As such, 10⁻⁵ * 10⁻⁶ = 10⁽⁻⁵ ⁺ ⁻⁶) = 10 ⁻¹¹ ;
______________________________________
So;  45 * 10⁻⁵ * 10⁻⁶ 

           =  45 * 10⁻¹¹ .
______________________________________

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3 years ago
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