Algebra-1

For (-x + 9)(6 + x) < 0,

1. Find roots: x = 9, x = -6.

2. Test intervals: x < -6, -6 < x < 9, x > 9.

3. Inequality is negative for x <-6  and x ＞ 9.

 

For 9(x + 1) < –6x,

Expand: 9x + 9 < -6x.

Combine: 15x < -9.

Divide: x < -

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