Solve 2x^2+7x-15 - ScanMath

Question

Factor the expression

(x + 5) (2 x - 3)

Evaluate

2 x^{2} + 7 x - 15

Rewrite the expression

2 x^{2} + (- 3 + 10) x - 15

Calculate

2 x^{2} - 3 x + 10 x - 15

Rewrite the expression

x \times 2 x - x \times 3 + 5 \times 2 x - 5 \times 3

Factor out x from the expression

x (2 x - 3) + 5 \times 2 x - 5 \times 3

Factor out 5 from the expression

x (2 x - 3) + 5 (2 x - 3)

Solution

(x + 5) (2 x - 3)

Show Solution

x_{1} = - 5, x_{2} = \frac{3}{2}

Alternative Form

x_{1} = - 5, x_{2} = 1.5

Evaluate

2 x^{2} + 7 x - 15

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

2 x^{2} + 7 x - 15 = 0

Factor the expression

More Steps

Evaluate

2 x^{2} + 7 x - 15

Rewrite the expression

2 x^{2} + (- 3 + 10) x - 15

Calculate

2 x^{2} - 3 x + 10 x - 15

Rewrite the expression

x \times 2 x - x \times 3 + 5 \times 2 x - 5 \times 3

Factor out x from the expression

x (2 x - 3) + 5 \times 2 x - 5 \times 3

Factor out 5 from the expression

x (2 x - 3) + 5 (2 x - 3)

Factor out 2 x - 3 from the expression

(x + 5) (2 x - 3)

(x + 5) (2 x - 3) = 0

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

x + 5 = 0 2 x - 3 = 0

Solve the equation for x

More Steps

Evaluate

x + 5 = 0

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

x = 0 - 5

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

x = - 5

x = - 5 2 x - 3 = 0

Solve the equation for x

More Steps

Evaluate

2 x - 3 = 0

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

2 x = 0 + 3

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

2 x = 3

Divide both sides

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

Divide the numbers

x = \frac{3}{2}

x = - 5 x = \frac{3}{2}

Solution

x_{1} = - 5, x_{2} = \frac{3}{2}

Alternative Form

x_{1} = - 5, x_{2} = 1.5

Show Solution