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Popular >

expand (3-y)^4

Solution

expand

(3 - y)^{4}

Solution

81 - 108 y + 54 y^{2} - 12 y^{3} + y^{4}

Solution steps

(3 - y)^{4}

Apply binomial theorem:

(a + b)^{n} = i = 0 \sum n (i n) a^{(n - i)} b^{i}

a = 3, b = - y

= i = 0 \sum 4 (i 4) \cdot 3^{(4 - i)} (- y)^{i}

Expand summation

= \frac{4 !}{0 ! ( 4 - 0 ) !} \cdot 3^{4} (- y)^{0} + \frac{4 !}{1 ! ( 4 - 1 ) !} \cdot 3^{3} (- y)^{1} + \frac{4 !}{2 ! ( 4 - 2 ) !} \cdot 3^{2} (- y)^{2} + \frac{4 !}{3 ! ( 4 - 3 ) !} \cdot 3^{1} (- y)^{3} + \frac{4 !}{4 ! ( 4 - 4 ) !} \cdot 3^{0} (- y)^{4}

Simplify

\frac{4 !}{0 ! ( 4 - 0 ) !} \cdot 3^{4} (- y)^{0} : 81

Simplify

\frac{4 !}{1 ! ( 4 - 1 ) !} \cdot 3^{3} (- y)^{1} : - 108 y

Simplify

\frac{4 !}{2 ! ( 4 - 2 ) !} \cdot 3^{2} (- y)^{2} : 54 y^{2}

Simplify

\frac{4 !}{3 ! ( 4 - 3 ) !} \cdot 3^{1} (- y)^{3} : - 12 y^{3}

Simplify

\frac{4 !}{4 ! ( 4 - 4 ) !} \cdot 3^{0} (- y)^{4} : y^{4}

= 81 - 108 y + 54 y^{2} - 12 y^{3} + y^{4}

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Frequently Asked Questions (FAQ)

What is expand (3-y)^4 ?
The solution to expand (3-y)^4 is 81-108y+54y^2-12y^3+y^4