Question

8.
The minimum value of y = 3x2 - 12x + 5 is :
(1) 7
(2) 0
(3) 1
(4) - 7

Answer 1

Answer:

your ans is ( 3 )

I hope it help you

Answer 2

${3x}^{2} - 12x + 5$

${\red{ a \:= \: 3 \\ b \: = \: -12 \\ c \: = \: 5$

$y = - {b} - + \sqrt{ {b}^{2} - 4ac }$

$y = - ( - 12) - + \sqrt{ { - 12}^{2} - 4 \times 3 \times 5 }$

$y = 12 + - \sqrt{144 - 60}$

$y = 12 - \sqrt{84}$

$y = 12 - 9.16$

$y = 3 ( approximately)$

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