en

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

expand ((n-1)*n)/2

Solution

expand

\frac{( n - 1 ) \cdot n}{2}

Solution

\frac{n ^{2}}{2} - \frac{n}{2}

Solution steps

\frac{( n - 1 ) n}{2}

Expand

(n - 1) n : n^{2} - n

= \frac{n ^{2} - n}{2}

Apply the fraction rule:

\frac{a \pm b}{c} = \frac{a}{c} \pm \frac{b}{c}

\frac{n ^{2} - n}{2} = \frac{n ^{2}}{2} - \frac{n}{2}

= \frac{n ^{2}}{2} - \frac{n}{2}

Popular Examples

expand (7x+2e^{7x+2})(3x^2)expand

(7 x + 2 e^{7 x + 2}) (3 x^{2})

expand (3y=sqrt(33-16y)-7+7i)(-2+5i)expand

(3 y = 33 - 16 y - 7 + 7 i) (- 2 + 5 i)

expand (3,4,5)y(1,-4,0)expand

(3, 4, 5) y (1, - 4, 0)

expand (pi(e^5-1))/(5e^5)expand

\frac{π ( e ^{5} - 1 )}{5 e ^{5}}

expand 7/((x-4)^3)expand

\frac{7}{( x - 4 ) ^{3}}

Frequently Asked Questions (FAQ)

What is expand ((n-1)*n)/2 ?
The solution to expand ((n-1)*n)/2 is (n^2)/2-n/2