Solve x^2-124x-51geq0

$$x ^ { 2 } - 124 x - 51 \geq 0$$

Solve for x

$$x\in (-\infty,62-\sqrt{3895}]\cup [\sqrt{3895}+62,\infty)$$

Steps Using the Quadratic Formula

To solve the inequality, factor the left hand side. Quadratic polynomial can be factored using the transformation ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right), where x_{1} and x_{2} are the solutions of the quadratic equation ax^{2}+bx+c=0.

$$x^{2}-124x-51=0$$

All equations of the form ax^{2}+bx+c=0 can be solved using the quadratic formula: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. Substitute 1 for a, -124 for b, and -51 for c in the quadratic formula.

$$x=\frac{-\left(-124\right)±\sqrt{\left(-124\right)^{2}-4\times 1\left(-51\right)}}{2}$$

Do the calculations.

$$x=\frac{124±2\sqrt{3895}}{2}$$

Solve the equation x=\frac{124±2\sqrt{3895}}{2} when ± is plus and when ± is minus.

$$x=\sqrt{3895}+62 x=62-\sqrt{3895}$$

Rewrite the inequality by using the obtained solutions.

$$\left(x-\left(\sqrt{3895}+62\right)\right)\left(x-\left(62-\sqrt{3895}\right)\right)\geq 0$$

For the product to be ≥0, x-\left(\sqrt{3895}+62\right) and x-\left(62-\sqrt{3895}\right) have to be both ≤0 or both ≥0. Consider the case when x-\left(\sqrt{3895}+62\right) and x-\left(62-\sqrt{3895}\right) are both ≤0.

$$x-\left(\sqrt{3895}+62\right)\leq 0 x-\left(62-\sqrt{3895}\right)\leq 0$$

The solution satisfying both inequalities is x\leq 62-\sqrt{3895}.

$$x\leq 62-\sqrt{3895}$$

Consider the case when x-\left(\sqrt{3895}+62\right) and x-\left(62-\sqrt{3895}\right) are both ≥0.

$$x-\left(62-\sqrt{3895}\right)\geq 0 x-\left(\sqrt{3895}+62\right)\geq 0$$

The solution satisfying both inequalities is x\geq \sqrt{3895}+62.

$$x\geq \sqrt{3895}+62$$

The final solution is the union of the obtained solutions.

$$x\leq 62-\sqrt{3895}\text{; }x\geq \sqrt{3895}+62$$