We need to solve the inequality $x^2 + 4x - 3 > 0$.

AlgebraQuadratic InequalitiesQuadratic FormulaInequalitiesRoots of Quadratic Equations
2025/4/2

1. Problem Description

We need to solve the inequality x2+4x3>0x^2 + 4x - 3 > 0.

2. Solution Steps

First, we find the roots of the quadratic equation x2+4x3=0x^2 + 4x - 3 = 0. We can use the quadratic formula:
x=b±b24ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}
In this case, a=1a=1, b=4b=4, and c=3c=-3.
Plugging these values into the formula, we get:
x=4±424(1)(3)2(1)x = \frac{-4 \pm \sqrt{4^2 - 4(1)(-3)}}{2(1)}
x=4±16+122x = \frac{-4 \pm \sqrt{16 + 12}}{2}
x=4±282x = \frac{-4 \pm \sqrt{28}}{2}
x=4±272x = \frac{-4 \pm 2\sqrt{7}}{2}
x=2±7x = -2 \pm \sqrt{7}
So, the roots are x1=27x_1 = -2 - \sqrt{7} and x2=2+7x_2 = -2 + \sqrt{7}.
Since the coefficient of x2x^2 is positive, the parabola opens upwards. This means that the inequality x2+4x3>0x^2 + 4x - 3 > 0 is satisfied when xx is less than the smaller root or greater than the larger root.
Therefore, the solution to the inequality is x<27x < -2 - \sqrt{7} or x>2+7x > -2 + \sqrt{7}.

3. Final Answer

x<27x < -2 - \sqrt{7} or x>2+7x > -2 + \sqrt{7}