# Simplify this maths problem?

I tried it and got 81/y^3 (0.04y^8)

What have I done wrong? Relevance
• --

( 18/y^4 ) x (y^8/25)

( 18/25 ) y^4

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• y8/y⁴ (81/25 ) = y ^(8-4) * 81/25

=81/25 y⁴

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• (-3/y)^4 (1/5 y^4)^2

= 81y^8 / (25 y^4)

= 81y^4 / 25

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• 81/y^4 (0.04y^8) is ok as far as it goes, but it could go further

81/y^4 * y^8 / 25

81/25 y⁴

• You've misread it...it's y^4 /5 NOT 1/(5y^4)

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• [(-3/y)^4][(y^4)/5]^2

=

[81/y^4][(y^8)/25]

=

(81y^4)/25

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• (-3/y)^4(1/5 y^4)^2

= (81/y^4)(y^8/25)

= 81y^4/25

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• First, keep fractions as fractions.

Then your y's can be combined from the first factor and the second factor.

You started correctly, but needed to finish things up.

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• Do each separately first....

(81/y^4) x (y^8/25) ......now multiply

81y^8 / 25y^4

(81y^4)/25

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