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ElenaW [278]
4 years ago
7

3x-5y=9whats the answer

Mathematics
1 answer:
Lera25 [3.4K]4 years ago
3 0
The answer to x :
3x-5y = 9
3x = 9+5y
x = (9+5y)/3


The answer to y :
3x-5y = 9
-5y = -3y+9
5y = 3y+9
y = (3y+9)/5
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Write a polynomial function, p(x) with degree 3 that has p(7)=0
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Answer:

p (x) = x^{3} - 21x^{2}+ 147x - 343

is the required polynomial with degree 3 and p ( 7 ) = 0

Step-by-step explanation:

Given:

p ( 7 ) = 0

To Find:

p ( x ) = ?

Solution:

Given p ( 7 ) = 0 that means substituting 7 in the polynomial function will get the value of the polynomial as 0.

Therefore zero's of the polynomial is seven i.e 7

Degree : Highest raise to power in the polynomial is the degree of the polynomial

We have the identity,

(a -b)^{3} = a^{3}-3a^{2}b +3ab^{2} - b^{3}

Take a = x

        b = 7

Substitute in the identity we get

(x -7)^{3} = x^{3}-3x^{2}(7) +3x(7)^{2} - 7^{3}\\(x -7)^{3} = x^{3}-21x^{2} +147x - 343

Which is the required Polynomial function in degree 3 and if we substitute 7 in the polynomial function will get the value of the polynomial function zero.

p ( 7 ) = 7³ - 21×7² + 147×7 - 7³

p ( 7 ) = 0

p (x) = x^{3} - 21x^{2}+ 147x - 343

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Answer:

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Step-by-step explanation:

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