sevenas62 sevenas62

08-04-2019
Mathematics

contestada

Solve for x.

[tex]x^{2} + 4x - 21 = 0[/tex]

A.) -3, -7

B.) -3, 7

C.) 3, -7

D.) 3, 7

Respuesta :

queenbeenanausi queenbeenanausi

08-04-2019

The answer is C. When using the magic X and then you have to set it up into a math equation which is X+7=0 and X-3=0 the 7 becomes negative and the 3 becomes positive

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