Question

3x (4x – 5) + 3 and find its values for (i) x = 3 (ii)x=1/2

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Answer 1

Answer:

i) 72

ii) 9/2 is the answer

Step-by-step explanation:

  3x(4x-5) + 3

  12x² - 15x + 9

put  x = 3

12(3)² -15(3) + 9

= 12 x 9 - 45 +9

= 108 - 45 + 9

=  72

Now, put x = 1/2

12(1/2)² - 15(1/2) + 9

12/4 - 15/2 + 9

3 - 15/2 + 9

(6 - 15 + 18)/2

9/2