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3 years ago

One factor of f(x)5x^3+5x^2-170+280 is (x + 7). What are all the roots of the function? Use the Remainder Theorem.

Mathematics

1 answer:

horsena [70]3 years ago

3 0

Answer: (b) x = -7, x = 2, x = 4

<u>Step-by-step explanation:</u>

Remainder Theorem is used to determine if a given value is a root.

It is stated that (x + 7) is a root ⇒ x + 7 = 0 ⇒ x = -7

We can confirm this by plugging in x = -7 and getting a value of 0.

f(x) = 5x³ + 5x² - 170x + 280

f(-7) = 5(-7)³ + 5(-7)² - 170(-7) + 280

= -1715 + 245 + 1190 + 280

= 0

CONFIRMED that x = -7 is a zero!

Next, let's try x = 2

f(2) = 5(2)³ + 5(2)² - 170(2) + 280

= 40 + 20 - 340 + 280

= 0

CONFIRMED that x = 2 is a zero!

Lastly, let's try x = 4

f(4) = 5(4)³ + 5(4)² - 170(4) + 280

= 320 + 80 - 680 + 280

= 0

CONFIRMED that x = 4 is a zero!

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