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Question

Simplify 3x(4x5)+3 and find the value for the given expression at x=3.

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Solution

3x(4x5)+3
=12x215x+3
=12x212x3x+3
=12x(x1)3(x1)
=(12x3)(x1)
=3(4x1)(x1)

Value x=3, then 3(4x1)(x1)=3(121)(31)
=66
Hence, the answer is 66.


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