evelynbrito2005 evelynbrito2005

09-06-2020
Mathematics

contestada

If f(x)= x2 + 7; Find x if f(x)= 23

Respuesta :

wegnerkolmp2741o wegnerkolmp2741o

09-06-2020

Answer:

x = 4, -4

Step-by-step explanation:

f(x)= x^2 + 7

f(x) =23

23 = x^2+7

Subtract 7 from each side

23-7 = x^2 +7-7

16 = x^2

Take the square root of each side

±sqrt(16) = sqrt(x^2)

±4 = x

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