agrosslarcrap agrosslarcrap

09-04-2017
Mathematics

contestada

Solve.

x^2 - 49 = 0
A) ±49
B) ±12
C) ±7
D) ±6

Respuesta :

12345678o1234 12345678o1234

09-04-2017

the answer is c
x^2 = 49
x = √49
√49 = ±7

Answer Link

09-04-2017

(X+7)((x-7)

This is call the difference of squares because there is no middle number and the last number is a square like 7×7 is 49
X+7=0. X-7=0
X=-7. X=7
C

Answer Link

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