3 years ago

I need the answer asap 20 points

Mathematics

1 answer:

Mekhanik [1.2K]3 years ago

5 0

Answer:

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natka813 [3]

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Step-by-step explanation:

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3 years ago

What is the coefficient of the third term in the binomial expansion of (a + b)6? 1 15 20 90

Sholpan [36]

Answer: 15

Step-by-step explanation:

(r+1)th term of $(a+b)^n$ is given by:-

$T_{r+1}=\ ^nC_r(a)^{n-r}b^r$

For $(a+b)^6$ , n= 6

$T_3=T_{2+1}=\ ^6C_2(a)^{6-2}(b)^2\\\\$

$=\ \dfrac{6!}{4!2!}a^4b^2\ \ \ [^nC_r=\dfrac{n!}{r!(n-r)!}]\\\\=\dfrac{6\times5\times4!}{4!\times2}a^4b^2\\\\=3\times5a^4b^2\\\\ =15a^4b^2$

Hence, the coefficient of the third term in the binomial expansion of $(a+b)^6$ is 15.

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3 years ago

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The question is in the link below.

Blababa [14]

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3 years ago

- ( x - 1 ) = -4x - 2

7nadin3 [17]

Answer:

x=-1

Step-by-step explanation:

1. Remove the parenthesis

-x + 1 = -4x - 2

2. Get x alone

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3=-3x -3x/-3= x 3/-3 = -1

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I think the answer is D, None of the above

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