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Question

Simplify: 3x[x2+1][2x(x2+x1)+1]x2

A
x33x2+x+1
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B
x33x2+5x1
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C
x3+x25x+1
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D
x3+3x2+5x1
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Solution

The correct option is A x33x2+5x1
3x[x2+1][2x(x2+x1)+1]x2
We need to follow BODMAS rule.
=> Brackets (parts of a calculation inside brackets always come first).
=> Orders (numbers involving powers or square roots).
=> Division.
=> Multiplication.
=> Addition.
=> Subtraction.
3x[x2+1][2x(x2+x1)+1]x2
= 3x.x2+3x.1[2x.x2+2x.x2x.1+1]x2
= 3x3+3x2x32x2+2x1x2
= x33x2+5x1

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