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dalvyx [7]
3 years ago
8

An unknown polynomial is added to the expression -3x^3+2x-5 and the resulting sum is 4x^3+7x^2-3. what is the unknown polynomial

?
Mathematics
1 answer:
DENIUS [597]3 years ago
8 0

Answer:

7x³ + 7x² + 2x - 8

Step-by-step explanation:

Let the unknown polynomial be a

a + -3x³ + 2x - 5 = 4x³ + 7x² - 3

a = 4x³ + 7x² - 3 - (-3x³ + 2x - 5)

a = 4x³ + 7x² - 3 + 3x³ + 2x - 5

a = 7x³ + 7x² + 2x - 8

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<span>Multiply (x-2)(3x+4) using the foil method 

</span>(x-2)(3x+4) =  \\  \\ (x*3x) +(x*4) +(-2*3x) +(-2*4) =  \\  \\ 3x^2 + 4x - 6x - 8 =  \\  \\ 3x^2 -2x - 8  \\  \\  \\  \boxed{(x-2)(3x+4) =3x^2 -2x - 8}<span>


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3 years ago
What is 2-(-8)????? And how do you solve it????
marusya05 [52]
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In terms of money, you can think of a negative number as an IOU or it represents the amount of debt. Writing -8 means you are 8 dollars in debt. If we subtract away debt, then we have less of it and effectively its the same as adding dollars to your pocket. Subtracting away 8 dollars of debt is the same as adding 8 dollars to your pocket, which is one interpretation of how 2-(-8) is the same as 2+8.

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