Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$2 { x }^{ 2 } +4x \geq 30$$

Solve for x

$x\in (-\infty,-5]\cup [3,\infty)$

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