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ohaa [14]
3 years ago
9

Help me out and answer correctly and if it's correct I will give brainliest

Mathematics
2 answers:
mrs_skeptik [129]3 years ago
7 0

Answer:

it should be d which is 7.50

Step-by-step explanation:

I know this because the given numbers are close to this answer plus how can it be 4 . If am wrong pls say so

Veronika [31]3 years ago
4 0
I think it is ethier D or C
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Step-by-step explanation:

let's look at the full numbers under the square roots when bringing the external factors back in :

sqrt(9×9×2) - sqrt(3×3×7) + sqrt(8) - sqrt(28)

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sqrt(3×3×3×3×2) - sqrt(3×3×7) + sqrt(2×2×2) - sqrt(2×2×7)

now we see that we have 2 pairs of square roots : 1 pair ends with a factor of 2, and one pair with a factor of 7.

let's combine these

sqrt (3×3×3×3×2) + sqrt(2×2×2) - sqrt(3×3×7) - sqrt (2×2×7)

and now we move the factors of 2 and 7 back out in front (of course, we need to apply the square root on these factors) :

9×sqrt(2) + 2×sqrt(2) - 3×sqrt(7) - 2×sqrt(7) =

= (9+2)×sqrt(2) - (3+2)×sqrt(7) = 11×sqrt(2) - 5×sqrt(7)

and that is the first answer option.

5 0
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