Question

28 divided root28 - root7​

Answer 1

Answer:

hope it wil help

Step-by-step explanation:

28/√28 - √7

28/√2×2×7- √7

28/2√7-√7

14/√7-√7

14×√7/√7×√7-√7

14√7/7-√7

2√7-√7

√7

Answer 2

$\frac{28}{ \sqrt{28} } - \sqrt{7} →1 \\ factorise \: \sqrt{28} \\ \sqrt{28} = \sqrt{2 \times 2 \times 7} = 2 \sqrt{7} \\ put \: this \: value \: in \: equation \: 1 \\ \frac{28}{2 \sqrt{7} } - \sqrt{7} \\ = \frac{28 - 14}{2 \sqrt{7} } \\ = \frac{14}{2 \sqrt{7} } \\ = \frac{14}{2 \sqrt{7} } \times \frac{ - 2 \sqrt{7} }{ - 2 \sqrt{7} } \\ = \frac{28 \sqrt{7} }{28} \\ = \sqrt{7}$

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