schuenkelisa
28.08.2020 •
Mathematics
F(x) = -x2 - 9x
Find f(-2)
Solved
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Ответ:
22
Step-by-step explanation:
replace -2 for every in the equation:
-(-2)x2-9x-2=22
Ответ:
Step-by-step explanation:
y = x + 2 (i)
y = -3x (ii)
substitute y = -3x i equation (i)
-3x = x + 2
-3x -x = 2
-4x = 2
x = 2/-4
x = -1/2
Substitute x = -1/2 in (ii)
y = -3 * -1/2
y = 3/2