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

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

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

The zeros of completesquare 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

Move

21

to the right side

x^{2} + 4 x = 21

Rewrite in the form

(x + a)^{2} = b

(x + 2)^{2} = 25

For

the solutions are

f (x) = a, - a

Solve

x + 2 = 25 : x = 3

Solve

x + 2 = - 25 : x = - 7

The solutions to the quadratic equation are:

x = 3, x = - 7

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

2 x^{2} + 24 x + 70 = 0

5 x (x + 2) = 2 x (x + 1)

x, x^{2} - 10 x + 25 = 0

x, z = (12 x - 2 x^{2}) + 22 y

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