Expand and simplify (x + 3)(x-4)

Mathematics

2 answers:

Hunter-Best [27]3 years ago

5 0

Answer:

2x -1

Step-by-step explanation:

x*x =2x 3-4 =-1

2x+-4

sweet [91]3 years ago

4 0

Answer: x^2x-12 (by the way ^2 is a square)

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Find all solutions by transforming the system to reduced echelon form and back substituting. (If there are an infinite number of

Zolol [24]

Answer:

The system has infinite solutions described in the set $\{(x_1,x_2,x_3)=(6+s1, -10-2s1,s1): s1\in\mathbb{R}\}$

Step-by-step explanation:

The augmented matrix of the system is $\left[\begin{array}{cccc}-1&-1&-1&4\\2&1&0&2\end{array}\right]$ .

We apply row operations:

1. We add the first row to the second row twice and obtain the matrix $\left[\begin{array}{cccc}-1&-1&-1&4\\0&-1&-2&10\end{array}\right]$

2. multiply by -1 the rows of the previous matrix and obtain the matrix $\left[\begin{array}{cccc}1&1&1&-4\\0&1&2&-10\end{array}\right]$ that is the reduced echelon form of the matrix associated to the system.