Question

simplify :4 root 20 + 1/2 root 245 + root 405

Answer 1

4√20 + 1/2√245 +√405

first of all see this
20 =2 × 2 ×5
√20 = 2√5

245 = 5 × 7 × 7
√245 = 7√5

405 = 5 × 9 × 9
√405 = 9√5

now put this in above ,
4(2√5) +1/2(7√5) + 9√5

=8√5 + 7√5/2 + 9√5

=(8+7/2+9)√5

=41√5/2

Answer 2

Hole amiga!

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4√20+1/2√245+√405
=8√5+1/2x7√5+9√5
=8√5+7/2√5+9√5
=41/2√5
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