Jovita Lim Si Yi's answer to Chori's Secondary 3 A Maths Singapore question.
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Square of x where x is -3 is 9, which is positive (for all real value of x, x square is positive).
Since negative times positive equals negative, hence -2x² is negative.
Since negative times positive equals negative, hence -2x² is negative.
Date Posted:
1 year ago
Add 4 on both side, since -2x²≤0, -2x²+4≤4
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