What are the solutions to the equation 0.3x^2+0.21x-0.78=0 ?

The solutions to the equation 0.3x^2+0.21x-0.78=0 are x= 13/10 ,x=-2

Find the zeros of 0.3x^2+0.21x-0.78=0

The zeros of 0.3x^2+0.21x-0.78=0 are x= 13/10 ,x=-2

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0.3 x^{2} + 0.21 x - 0.78 = 0

x = \frac{13}{10}, x = - 2

Decimal Notation

x = 1.3, x = - 2

Solution steps

0.3 x^{2} + 0.21 x - 0.78 = 0

Multiply both sides by

100

30 x^{2} + 21 x - 78 = 0

Solve with the quadratic formula

x_{1, 2} = \frac{- 21 \pm 2 1 ^{2} - 4 \cdot 30 ( - 78 )}{2 \cdot 30}

2 1^{2} - 4 \cdot 30 (- 78) = 99

x_{1, 2} = \frac{- 21 \pm 99}{2 \cdot 30}

Separate the solutions

x_{1} = \frac{- 21 + 99}{2 \cdot 30}, x_{2} = \frac{- 21 - 99}{2 \cdot 30}

x = \frac{- 21 + 99}{2 \cdot 30} : \frac{13}{10}

x = \frac{- 21 - 99}{2 \cdot 30} : - 2

The solutions to the quadratic equation are:

x = \frac{13}{10}, x = - 2

x^{2} + 8 x = 16

5 x^{2} + 6 x - 8

\frac{3 - x}{x - 1} > 1

(i - 1)^{3}

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

What are the solutions to the equation 0.3x^2+0.21x-0.78=0 ?
The solutions to the equation 0.3x^2+0.21x-0.78=0 are x= 13/10 ,x=-2
Find the zeros of 0.3x^2+0.21x-0.78=0
The zeros of 0.3x^2+0.21x-0.78=0 are x= 13/10 ,x=-2