simplify the surd 8 root 45 - 6 root 20 + root 245 - 3 root 125
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= 8√45 -6√20 +√245 -3√125
= 8√9×5 -6√4×5 +√49×5 -3√25×5
= 8×3√5 -6×2√5 +7×√5 -3×5×√5
= 24√5 -12√5 +7√5 -15√5
= (24 - 12 + 7 - 15)√5
= 4√5
= 4 × 2.236
= 8.944 ( approximately ).
!! DONE !!
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