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Popular >

expand (y+1)^5

Solution

expand

(y + 1)^{5}

Solution

y^{5} + 5 y^{4} + 10 y^{3} + 10 y^{2} + 5 y + 1

Solution steps

(y + 1)^{5}

Apply binomial theorem:

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

a = y, b = 1

= i = 0 \sum 5 (i 5) y^{(5 - i)} \cdot 1^{i}

Expand summation

= \frac{5 !}{0 ! ( 5 - 0 ) !} y^{5} \cdot 1^{0} + \frac{5 !}{1 ! ( 5 - 1 ) !} y^{4} \cdot 1^{1} + \frac{5 !}{2 ! ( 5 - 2 ) !} y^{3} \cdot 1^{2} + \frac{5 !}{3 ! ( 5 - 3 ) !} y^{2} \cdot 1^{3} + \frac{5 !}{4 ! ( 5 - 4 ) !} y^{1} \cdot 1^{4} + \frac{5 !}{5 ! ( 5 - 5 ) !} y^{0} \cdot 1^{5}

Simplify

\frac{5 !}{0 ! ( 5 - 0 ) !} y^{5} \cdot 1^{0} : y^{5}

Simplify

\frac{5 !}{1 ! ( 5 - 1 ) !} y^{4} \cdot 1^{1} : 5 y^{4}

Simplify

\frac{5 !}{2 ! ( 5 - 2 ) !} y^{3} \cdot 1^{2} : 10 y^{3}

Simplify

\frac{5 !}{3 ! ( 5 - 3 ) !} y^{2} \cdot 1^{3} : 10 y^{2}

Simplify

\frac{5 !}{4 ! ( 5 - 4 ) !} y^{1} \cdot 1^{4} : 5 y

Simplify

\frac{5 !}{5 ! ( 5 - 5 ) !} y^{0} \cdot 1^{5} : 1

= y^{5} + 5 y^{4} + 10 y^{3} + 10 y^{2} + 5 y + 1

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Frequently Asked Questions (FAQ)

What is expand (y+1)^5 ?
The solution to expand (y+1)^5 is y^5+5y^4+10y^3+10y^2+5y+1