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3 years ago

Which expression is equivalent? −4(5x + 2)

Mathematics

2 answers:

iVinArrow [24]3 years ago

7 0

-20x+2 is equivelent

yulyashka [42]3 years ago

3 0

- 20x - 8

multiply each term in the bracket by the - 4 ( distributive law )

= (- 4 × 5x ) + (- 4 × 2 ) = - 20x - 8

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Lady bird [3.3K]

Answer: x=-2

Step-by-step explanation:

First subtract 4 from both sides

Sqrt(x+3)=1

Then square both sides

X+3=1

Then subtract 3

X=-2

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blsea [12.9K]

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What is the coefficient of x²y^8 in the expansion of (x + y)^10?

rjkz [21]

Answer: 45

Step-by-step explanation:

We know that $(m+1)^{th}$ term in the binomial expansion of $(a+b)^n$ is given by :-

$T_{r+1}=^nC_m a^{n-m}b^m$

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$T_{r+1}=^{10}C_m x^{10-m}y^m$ (1)

When we compare (1) to $x^2y^8$ , we get m=8

Then, the coefficient of $x^2y^8$ from (1) will be :-

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Hence, the coefficient of $x^2y^8$ is 45.

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