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Popular >

expand (x-3)^4

Solution

expand

(x - 3)^{4}

Solution

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

Solution steps

(x - 3)^{4}

Apply binomial theorem:

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

a = x, b = - 3

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

Expand summation

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

Simplify

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

Simplify

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

Simplify

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

Simplify

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

Simplify

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

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

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Frequently Asked Questions (FAQ)

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