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Question

Simplify: 3x(4x5)+3 and find its values for x=12

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Solution

3x(4x5)+3
=12x215x+3
=3(4x25x+1)
=3(4x24xx+1)
=3(4x(x1)1(x1))
=3(x1)(4x1) at x=12
=3(121)(4×121)
=3×12×(21)
=32

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