Question
Factorise:
$a b\left(x^2+y^2\right)-x y\left(a^2+b^2\right)$
$a b\left(x^2+y^2\right)-x y\left(a^2+b^2\right)$
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| Weight (in kg) | 45 | 46 | 48 | 50 | 52 | 54 | 55 |
| Number of boys | 8 | 5 | 6 | 9 | 7 | 4 | 2 |
