What are the solutions to the equation completesquare x^2+10x+21=0 ?

The solutions to the equation completesquare x^2+10x+21=0 are x=-3,x=-7

Find the zeros of completesquare x^2+10x+21=0

The zeros of completesquare x^2+10x+21=0 are x=-3,x=-7

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x^{2} + 10 x + 21 = 0

x = - 3, x = - 7

Solution steps

x^{2} + 10 x + 21 = 0

Move

21

to the right side

x^{2} + 10 x = - 21

Rewrite in the form

(x + a)^{2} = b

(x + 5)^{2} = 4

For

the solutions are

f (x) = a, - a

Solve

x + 5 = 4 : x = - 3

Solve

x + 5 = - 4 : x = - 7

The solutions to the quadratic equation are:

x = - 3, x = - 7

x^{2} - 15 = 106

4 (x^{2} - 7) + 27 = - 12 x^{2}

x^{2} - 3 x = 6

x^{2} - 4 x - 5 = 0

x^{2} + 26 x

What are the solutions to the equation completesquare x^2+10x+21=0 ?
The solutions to the equation completesquare x^2+10x+21=0 are x=-3,x=-7
Find the zeros of completesquare x^2+10x+21=0
The zeros of completesquare x^2+10x+21=0 are x=-3,x=-7