Solve 7x^2-14x+10>0

$$7 x ^ { 2 } - 14 x + 10 > 0$$

Solve for x

$$x\in \mathrm{R}$$

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.

$$7x^{2}-14x+10=0$$

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 7 for a, -14 for b, and 10 for c in the quadratic formula.

$$x=\frac{-\left(-14\right)±\sqrt{\left(-14\right)^{2}-4\times 7\times 10}}{2\times 7}$$

Do the calculations.

$$x=\frac{14±\sqrt{-84}}{14}$$

Since the square root of a negative number is not defined in the real field, there are no solutions. Expression 7x^{2}-14x+10 has the same sign for any x. To determine the sign, calculate the value of the expression for x=0.

$$7\times 0^{2}-14\times 0+10=10$$

The value of the expression 7x^{2}-14x+10 is always positive. Inequality holds for x\in \mathrm{R}.

$$x\in \mathrm{R}$$