Question 993358
f(x) = −2(x + 1)^2 + 4
f(x) = -2(x^2+2x+1) + 4
f(x) = -2x^2-4x+2
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{{{graph(400,400,-10,10,-10,10,-2x^2-4x+2)}}}
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Take the derivative to get:
f'(x) = -4x-4
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Increasing:?
Solve: -4x-4 > 0
-4x > 4
x < -1
Increasing on (-oo,-1)
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Decreasing:?
Solve: -4x-4 < 0
-4x < 4 
x > -1
Decreasing on (-1,+oo)
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Cheers,
Stan H.