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Question
Simplify:
12x − [3x3 + 5x2 − {7x2 − (4 − 3x − x3) + 6x3} − 3x]
Solution
12x − [3x3 + 5x2 − {7x2 − (4 − 3x − x3) + 6x3} − 3x]
We will first remove the innermost grouping symbol ( ), followed by { } and then [ ].
∴ 12x − [3x3 + 5x2 − {7x2 − (4 − 3x − x3) + 6x3} − 3x]
= 12x − [3x3 + 5x2 − {7x2 − 4 + 3x + x3+ 6x3} − 3x]
= 12x − [3x3 + 5x2 − {7x2 − 4 + 3x + 7x3} − 3x]
= 12x − [3x3 + 5x2 − 7x2 + 4 − 3x − 7x3 − 3x]
= 12x − [ − 2x2 + 4 − 4x3 − 6x]
= 12x + 2x2 − 4 + 4x3 + 6x
= 4x3 + 2x2 +18x-4
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