The point (2, 15) is in the shaded region of which of the following inequalities?
A) y<-x^2-4x+1
B) y>-2x^2-4x
---(slash under the >)
C) Y<2x^2+3x+1
D) Y>2x^2+3x+1
i got B. :)
point ( 2, 15 ) mean :
x = 2
y = 15
A )
15 < - ( 2 ) ^ 2 - 4 * 2 + 1
15 < - 4 - 8 + 1
15 < - 11
Incorrect
B )
15 > - ( 2 ) ^ 2 - 4 * 2
15 > - 4 - 8
15 > - 12
Correct
C )
15 < 2 * 2 ^ 2 + 3 * 2 + 1
15 < 2 * 4 + 6 + 1
15 < 8 + 6 + 1
15 < 15
Incorrect
D )
15 > 2 * 2 ^ 2 + 3 * 2 + 1
15 > 2 * 4 + 3 * 2 + 1
15 > 8 + 6 + 1
15 > 15
incorrect
Answer : B )