Linear Algebra Examples

$- 7 \sqrt{145 - 136}$

Step 1

Subtract $136$ from $145$ .

$- 7 \sqrt{9}$

Step 2

Rewrite $9$ as $3^{2}$ .

$- 7 \sqrt{3^{2}}$

Step 3

Pull terms out from under the radical, assuming positive real numbers.

$- 7 \cdot 3$

Step 4

Multiply $- 7$ by $3$ .

$- 21$