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2020 Trial MPSM
H S
Question 19
2(x2 − 9) − (3x + 1)2 =
A −7x2 − 6x − 19 Correct
B −7x2 + 6x − 17 Incorrect
C 7x2 − 6x + 17
D 7x2 + 6x + 19
H Hint

Expand each bracket first, then combine like terms in x2, x, and constants carefully.

S Step-by-Step
  1. Expand 2(x2 − 9) = 2x2 − 18.
  2. Expand (3x + 1)2 = 9x2 + 6x + 1.
  3. Subtract: (2x2 − 18) − (9x2 + 6x + 1).
  4. Simplify: −7x2 − 6x − 19.
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