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Question
Simplify 3x (4x − 5) + 3 and find its values for x = 3.
Sum
Solution
3x (4x − 5) + 3
= 12x2 − 15x + 3
For x = 3,
12x2 − 15x + 3
= 12 (3)2 − 15 (3) + 3
= 108 − 45 + 3
= 66
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