2 years ago

Please i need help with this

Mathematics

1 answer:

Goshia [24]2 years ago

8 0

Answer:

Step-by-step explanation:

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Boris bought 28 pounds of sugar for $11.

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3 years ago

Complete the steps to solve the polynomial equation x3 – 21x = –20. According to the rational root theorem, which number is a po

jeka94

Answer:

Zeroes : 1, 4 and -5.

Potential roots: $\pm 1, \pm 2, \pm 4, \pm 5, \pm 10, \pm 20$ .

Step-by-step explanation:

The given equation is

$x^3-21x=-20$

It can be written as

$x^3+0x^2-21x+20=0$

Splitting the middle terms, we get

$x^3-x^2+x^2-x-20x+20=0$

$x^2(x-1)+x(x-1)-20(x-1)=0$

$(x-1)(x^2+x-20)=0$

Splitting the middle terms, we get

$(x-1)(x^2+5x-4x-20)=0$

$(x-1)(x(x+5)-4(x+5))=0$

$(x-1)(x+5)(x-4)=0$

Using zero product property, we get

$x-1=0\Rightarrow x=1$

$x-4=0\Rightarrow x=4$

$x+5=0\Rightarrow x=-5$

Therefore, the zeroes of the equation are 1, 4 and -5.

According to rational root theorem, the potential root of the polynomial are

$x=\dfrac{\text{Factor of constant}}{\text{Factor of leading coefficient}}$

Constant = 20

Factors of constant ±1, ±2, ±4, ±5, ±10, ±20.

Leading coefficient= 1

Factors of leading coefficient ±1.

Therefore, the potential root of the polynomial are $\pm 1, \pm 2, \pm 4, \pm 5, \pm 10, \pm 20$ .

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3 years ago

Help please

natta225 [31]

Using V = ⅓[base area×height]
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v= ⅓[ 4.92]
v = 1.6m³

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3 years ago

7 yards and 2 feet is equal to how many feet

alisha [4.7K]

<span>7 yards 2 feet = 23 feet
</span>

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3 years ago

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5(2x-8)<br><br>please help. I will mark brainliest!

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Answer:

just multiply 2x-8 by 5

which is

$10x - 40$

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2 years ago

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