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which option is right

Which Option Is Right class=

Sagot :

Reinhard10158idn

Step-by-step explanation:

just try the values.

and remember the vertex of a parabola

ax² + bx + c = 0

x value of the vertex = -b/2a

in our case

a = 1

b = -4

c = -21

x-vertex = - -4/(2×1) = 4/2 = 2

y-vertex = 2² - 4×2 - 21 = 4 - 8 - 21 = -25

C is correct

about the 0s :

there is only one option with x = -3. so, let's try this first :

0 = (-3)² - 4×-3 - 21 = 9 + 12 - 21 = 0

so, A is correct

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