What are the solutions to the equation -4x^2-8x+21=0 ?

The solutions to the equation -4x^2-8x+21=0 are x=-7/2 ,x= 3/2

Find the zeros of -4x^2-8x+21=0

The zeros of -4x^2-8x+21=0 are x=-7/2 ,x= 3/2

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- 4 x^{2} - 8 x + 21 = 0

x = - \frac{7}{2}, x = \frac{3}{2}

Decimal Notation

x = - 3.5, x = 1.5

Solution steps

- 4 x^{2} - 8 x + 21 = 0

Solve with the quadratic formula

x_{1, 2} = \frac{- ( - 8 ) \pm ( - 8 ) ^{2} - 4 ( - 4 ) \cdot 21}{2 ( - 4 )}

(- 8)^{2} - 4 (- 4) \cdot 21 = 20

x_{1, 2} = \frac{- ( - 8 ) \pm 20}{2 ( - 4 )}

Separate the solutions

x_{1} = \frac{- ( - 8 ) + 20}{2 ( - 4 )}, x_{2} = \frac{- ( - 8 ) - 20}{2 ( - 4 )}

x = \frac{- ( - 8 ) + 20}{2 ( - 4 )} : - \frac{7}{2}

x = \frac{- ( - 8 ) - 20}{2 ( - 4 )} : \frac{3}{2}

The solutions to the quadratic equation are:

x = - \frac{7}{2}, x = \frac{3}{2}

3 x^{3} + 18 x^{2} + 15 x

x^{2} + 1 x - 2

- 36 - 2 (w + 77) > - 4 (2 w + 52)

15 a^{2} (a + 1)^{6} + 20 a^{5} (a + 1)^{3}

x^{2} - 7 x - 25 = 0

What are the solutions to the equation -4x^2-8x+21=0 ?
The solutions to the equation -4x^2-8x+21=0 are x=-7/2 ,x= 3/2
Find the zeros of -4x^2-8x+21=0
The zeros of -4x^2-8x+21=0 are x=-7/2 ,x= 3/2