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What is the value of 7.8 - x to the power of 2 when = 3?

What is the Value of 7.8 - x to the power of 2 when x = 3?Please show work

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Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
3.0 3.0 (1 lesson ratings) (1)
1
Hi Chris;
x=3
 
(7.8-x)2
or
7.8-x2
 
I will begin with the first...
(7.8-3)2
(4.8)2
(4.8)(4.8)
23.04
 
Second...
7.8-32
7.8-9
-1.2

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Gary W. | Experienced Tutor--Taught K up to College level classesExperienced Tutor--Taught K up to Colleg...
4.9 4.9 (225 lesson ratings) (225)
0
(7.8-3)^2=
4.8^2=23.04