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Dahasolnce [82]
3 years ago
8

Multiply the polynomials (x+4)(x^2-5x+3)

Mathematics
2 answers:
Vladimir79 [104]3 years ago
8 0

Answer:

\\ x^{3} - x^{2} - 17x + 12

Step-by-step explanation:

Write the polynomials one above the other to multiply them:

\\ x^{2} -5x + 3\\

         \\ x + 4\\

<h3 /><h3>First Step</h3>

Multiply each element of \\ x^{2} -5x + 3\\ by 4:

The result is: \\ 4x^{2} - 20x + 12 [1]

As it can be seen, only the coefficients are multiplied by 4, and when the operation involves multiplication with coefficients with different operators (+ or -), the following rules are crucial:  

\\ + * + = +

\\ - * - = +

\\ + * - = -

\\ - * + = -

That is why 4 times -5 = -20,  4 times 1 = 4, and so 4 times 3 = 12.

<h3 /><h3>Second Step</h3>

Multiply each element of \\ x^{2} -5x + 3\\ by x:

The same rules apply here, but including the addition of powers or exponents.

The result is: \\ x^{3} - 5x^{2} + 3x [2].

\\ x * x^{2} = x^{3} or \\ x * x^{2} = x^{1+2} =x^{3}

\\ x * (-5x)=-5x^{2}

\\ x*3 = 3x

<h3 /><h3>Third Step</h3>

Sum all similar terms of the previous results [1] and [2].

The result is: \\ x^{3}-x^{2}-17x +12, because

         \\ 4x^{2} - 20x + 12

\\ x^{3} - 5x^{2} + 3x

__________________________

\\ x^{3} + (4-5)x^{2} + (-20+3)x+12

\\ x^{3} + (-1)x^{2} + (-17)x+12

\\ x^{3} - x^{2} -17x+12.

tatiyna3 years ago
6 0
(<span>4x2</span><span> – </span><span>4x</span><span> – </span>7)(x<span> + </span>3)<span> 
</span>  =  (<span>4x2</span><span> – </span><span>4x</span><span> – </span>7)(x) + (<span>4x2</span><span> – </span><span>4x</span><span> – </span>7)(3)<span> 
</span><span>  =  </span><span>4x2</span>(x<span>) – </span><span>4x</span>(x<span>) – </span>7(x<span>) + </span><span>4x2</span>(3<span>) – </span><span>4x</span>(3<span>) – </span>7(3)<span> 
</span><span>  =  4x3 – 4x2 – 7x + 12x2 – 12x – 21</span><span> 
</span><span>  =  4x3 – 4x2 + 12x2 – 7x – 12x – 21</span><span> 
</span><span>  =  4x3 + 8x2 – 19x – 21</span>
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