High school mathematics, how to find this X range, ask for details. - Training Enrollment Network

High school mathematics, how to find this X range, ask for details.

Multi-axial root penetration method

∵x？ -3x- 10=(x-5)(x+2), ∴ equation x? -3x- 10=0 is 5 and -2.

As can be seen from the figure,

x？ The solution of -3x- 10≤0 is: -2≤x≤5.

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