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3 years ago

PLEASE ANSWER FAST ILL GIVE BRAINLIEST AND EXPLAI NTOO PLEASE

Mathematics

2 answers:

icang [17]3 years ago

8 0

Answer:

x3 + 2x^2 - 15

Step-by-step explanation:

So, we get:

= x * x^2 - x * 3x + 5 * x^2 - 5 * 3x

= x^3 - 3x^2 + 5x^2 - 15x

= x^3 + 2x^2 - 15

max2010maxim [7]3 years ago

4 0

First start with x and multiply it by each variable in the second parentheses. So x^2 * x = x^3 and x * -3x = -3x^2. Do the same but with 5 next. 5 * x^2 = 5x^2 and 5 * - 3x = -15x. Then add them all together to get x^3 +2x^2 - 15x.

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$\left[\begin{array}{cccc|c}3&2&-4&2&-23\\0&5&-6&8&-58\\0&0&-91&153&-823\\0&0&0&13080&-39240\end{array}\right]$

Multiply row 4 by 1/13080:

$\left[\begin{array}{cccc|c}3&2&-4&2&-23\\0&5&-6&8&-58\\0&0&-91&153&-823\\0&0&0&1&-3\end{array}\right]$

Add -153(row 4) to row 3:

$\left[\begin{array}{cccc|c}3&2&-4&2&-23\\0&5&-6&8&-58\\0&0&-91&0&-364\\0&0&0&1&-3\end{array}\right]$

Multiply row 3 by -1/91:

$\left[\begin{array}{cccc|c}3&2&-4&2&-23\\0&5&-6&8&-58\\0&0&1&0&4\\0&0&0&1&-3\end{array}\right]$

Add 6(row 3) and -8(row 4) to row 2:

$\left[\begin{array}{cccc|c}3&2&-4&2&-23\\0&5&0&0&-10\\0&0&1&0&4\\0&0&0&1&-3\end{array}\right]$

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