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larisa [96]
2 years ago
12

What is the answer to this problem?

Mathematics
1 answer:
Sedaia [141]2 years ago
8 0

Answer:

x = 4.

Step-by-step explanation:

These are exterior  alternate angles which are congruent.

So 21x + 6 = 90

21x = 84

x = 4.

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Step-by-step explanation:

Given:

f(x)=x^3+7x^2+7x-15

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f(-3)= (-3)^3+7(-3)^2+7(-3)-15

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f(-5)=(-5)^3+7(-5)^2+7(-5)-15

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f(15)=(15)^3+7(15)^2+7(15)-15

     =5040

f(-15)=(-15)^3+7(-15)^2+7(-15)-15

      =-1920

Hence the rational roots are 1,-3,-5 !

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