19. Which of the following function is quadratic?
a. y = x³ + 3x² + 2x + 1
b. y = (x+3)(x–2)
c. y = 3x–5
d. y = 5
a. y = x³ + 3x² + 2x + 1
b. y = (x+3)(x–2)
c. y = 3x–5
d. y = 5
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Answer:
Letter b. y=(x+3)(x-2) is an example of quadratic function.
19. Which of the following function is quadratic?
B. y=(x+3)(x-2)
-•FOIL method•-
=(x+3)(x-2)
= x²-2x+3x-6
y =x²+1x-6=0 (a quadratic equation)
Therefore, ang letrang B ang tamang
sagot.
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