Question

$( \frac{1}{7?} x - \frac{1}{8?} y)(7x { }^{2} - 8y {?}^{2} )$
multiply
1.
$x {}^{2} (x ^{2} + 5) - 6(x { }^{2} - 5) \\ x {}^{4} + 5x {}^{2} - 6x {}^{2} - 30 \\ \\ x {}^{4} - 1x {}^{2} - 30$
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Answer 1

Answer:

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