Solve 3x^2 + 2x - 8

Question

Factor the expression

(x + 2) (3 x - 4)

Evaluate

3 x^{2} + 2 x - 8

Rewrite the expression

3 x^{2} + (- 4 + 6) x - 8

Calculate

3 x^{2} - 4 x + 6 x - 8

Rewrite the expression

x \times 3 x - x \times 4 + 2 \times 3 x - 2 \times 4

Factor out x from the expression

x (3 x - 4) + 2 \times 3 x - 2 \times 4

Factor out 2 from the expression

x (3 x - 4) + 2 (3 x - 4)

Solution

(x + 2) (3 x - 4)

Show Solution

x_{1} = - 2, x_{2} = \frac{4}{3}

Alternative Form

x_{1} = - 2, x_{2} = 1. \dot{3}

Evaluate

3 x^{2} + 2 x - 8

To find the roots of the expression,set the expression equal to 0

3 x^{2} + 2 x - 8 = 0

Factor the expression

More Steps

Evaluate

3 x^{2} + 2 x - 8

Rewrite the expression

3 x^{2} + (- 4 + 6) x - 8

Calculate

3 x^{2} - 4 x + 6 x - 8

Rewrite the expression

x \times 3 x - x \times 4 + 2 \times 3 x - 2 \times 4

Factor out x from the expression

x (3 x - 4) + 2 \times 3 x - 2 \times 4

Factor out 2 from the expression

x (3 x - 4) + 2 (3 x - 4)

Factor out 3 x - 4 from the expression

(x + 2) (3 x - 4)

(x + 2) (3 x - 4) = 0

When the product of factors equals 0,at least one factor is 0

x + 2 = 0 3 x - 4 = 0

Solve the equation for x

More Steps

Evaluate

x + 2 = 0

Move the constant to the right-hand side and change its sign

x = 0 - 2

Removing 0 doesn't change the value,so remove it from the expression

x = - 2

x = - 2 3 x - 4 = 0

Solve the equation for x

More Steps

Evaluate

3 x - 4 = 0

Move the constant to the right-hand side and change its sign

3 x = 0 + 4

Removing 0 doesn't change the value,so remove it from the expression

3 x = 4

Divide both sides

\frac{3 x}{3} = \frac{4}{3}

Divide the numbers

x = \frac{4}{3}

x = - 2 x = \frac{4}{3}

Solution

x_{1} = - 2, x_{2} = \frac{4}{3}

Alternative Form

x_{1} = - 2, x_{2} = 1. \dot{3}

Show Solution