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46x times 87y

the square root of 90

divide the top and bottom

[46x] * [87y] / sqrt(90)  =

[46x] * [87y] / [3sqrt(10)] =

[46xy] * [87/3] * [1 / sqrt(10) ] =

[46xy] * [29) * [1/ sqrt(10)]  =

1334xy / sqrt(10)       multiply top/bottom by sqrt(10)

[1334*sqrt(10)* xy]  / 10