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

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

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

The zeros of factor x^2-4x-21=0 are x=-3,x=7

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

x = - 3, x = 7

Solution steps

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

Factor

x^{2} - 4 x - 21 : (x + 3) (x - 7)

(x + 3) (x - 7) = 0

Using the Zero Factor Principle:

ab = 0

then

a = 0

b = 0

x + 3 = 0 or x - 7 = 0

Solve

x + 3 = 0 : x = - 3

Solve

x - 7 = 0 : x = 7

The solutions to the quadratic equation are:

x = - 3, x = 7

y, x^{2} + x y^{2} - y^{2} = 0

t, h = \frac{1}{2} g t^{2}

3 x^{2} + 39 = 30 x

- y + 28 + y^{2} = 2 y + 2 y^{2}

16 x^{2} + 72 x + 83 = 0

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