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2 years ago

12

Help me with this math question please

1 answer:

JulsSmile [24]2 years ago

4 0

Answer:

60 small and 140 large = 60 + 280 = 340 this is correct!

Step-by-step explanation:

I guess we just use the process of eleimation.

50 small and 150 Large = 50+300 = 350 so that's not right.

130 small and 70 large = 130 + 140 = 270 so, that's not right.

120 small and 80 large = 120 + 160 = 280 so, that's not right.

60 small and 140 large = 60 + 280 = 340 this is correct!

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Slav-nsk [51]

Question:

Find numbers a and k so that x-2 is a factor of

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Answer:

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Step-by-step explanation:

Given

$f(x)=x^4-2ax^3+ax^2- x+k$

$Factor:\ x - 4$

$f(-1)=3$

Required

Find a and k

For $f(-1)=3$

Substitute -1 for x

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Substitute 3 for f(-1)

$3 = 2 +3a + k$

Collect Like Terms

$3 - 2 = 3a + k$

$1 = 3a + k$

Also:

If $x - 2$ is a factor, then

$f(2) = 0$

Substitute 2 for x and 0 for f(x)

$f(x)=x^4-2ax^3+ax^2- x+k$

$0 = 2^4 - 2a * 2^3 + a * 2^2 - 2 + k$

$0 = 16 - 2a * 8 + a * 4 - 2 + k$

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$k = 12a - 14$

Substitute 12a - 14 for k in $1 = 3a + k$

$1 = 3a + 12a - 14$

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Collect Like Terms

$15a = 1 + 14$

$15a = 15$

Solve for a

$a = \frac{15}{15}$

$a=1$

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$k = 12 * 1 - 14$

$k = 12 - 14$

$k = -2$

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2 years ago