Question

adding / subtracting radical expressions
score: 0/4 penalty: none
question
express in simplest radical form.
4\sqrt{7} - \sqrt{7}
answer attempt 1 out of 3

Explanation:

Step1: Factor out common radical

$4\sqrt{7} - 1\sqrt{7} = (4-1)\sqrt{7}$

Step2: Subtract coefficients

$(4-1)\sqrt{7} = 3\sqrt{7}$

Answer:

$3\sqrt{7}$