Evaluate
1-\sqrt{7}\approx -1.645751311
Share
Copied to clipboard
\left(\sqrt{7}\right)^{2}+2\sqrt{7}-3\sqrt{7}-6
Apply the distributive property by multiplying each term of \sqrt{7}-3 by each term of \sqrt{7}+2.
7+2\sqrt{7}-3\sqrt{7}-6
The square of \sqrt{7} is 7.
7-\sqrt{7}-6
Combine 2\sqrt{7} and -3\sqrt{7} to get -\sqrt{7}.
1-\sqrt{7}
Subtract 6 from 7 to get 1.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}