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Mama L [17]
3 years ago
15

I need the answer asap 20 points

Mathematics
1 answer:
Mekhanik [1.2K]3 years ago
5 0

Answer:

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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.

3 0
3 years ago
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The question is in the link below.
Blababa [14]

Answer:

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4 0
3 years ago
- ( x - 1 ) = -4x - 2
7nadin3 [17]

Answer:

x=-1

Step-by-step explanation:

1. Remove the parenthesis

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1=-3x - 2

+2      +2

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

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3 years ago
A) equal lines<br> B) parallel lines<br> C) perpendicular lines<br> D) None of the above
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I think the answer is D, None of the above
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