18. 2-(-8) + (-3) = A. 1 B. 14 C. 12 D.7

Mathematics

2 answers:

salantis [7]3 years ago

8 0

Answer:18.2-(-8)+(-3)

36+8-3=41

ioda3 years ago

4 0

Answer:

I think it’s 7 so D

Step-by-step explanation:

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enyata [817]

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3 years ago

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What is the product of the polynomial 2x^3 + 8x^2 + x + 3 times the<br> monomial x?

Elis [28]

Answer:

$\huge\boxed{2x^4 + 8x^3 + x^2 + 3x}$

Step-by-step explanation:

When we multiply a polynomial by a specific monomial, all terms in the polynomial get multiplied by the monomial.

So we can do this by term.

$2x^3 \cdot x$

Multiplying x by x to the something power will just increase the exponent on the x term by one (since powers are just x multiplied by itself). This means the exponent here will increase by 1, so this becomes $2x^4$ .

Same logic applies to the second term: $8x^2$ , raise the exponent by one, $8x^3$ .

For the third term, if there is no exponent on a term you can assume it's exponent is 1 (so $x^1$ in this case - as $x^1=x$ ). Again, using the same logic, this turns into $x^2$ .

For the last term, when we multiply a constant by a variable, we get a term with a variable and a coefficient - the constant becomes the coefficient and the variable stays the variable. Therefore, $3 \cdot x = 3x$ .