Question

4*root20+1/2*root245-root405

Answer 1

Answer:

4

$4 \sqrt{20 + } .5 \times \sqrt{245 } - \sqrt{405} = 4 \times 2 \sqrt{5} + .5 \times 7 \sqrt{5} - 9 \sqrt[5 ] = 8 \sqrt{5} + 3.5 \sqrt{5} - 9 \sqrt[5] = 11.5 \sqrt{5} - 9 \sqrt{5} = 2.5 \sqrt{5} = 2 .5\times 2.23 = 5.575$