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1. (3x + 5)(3x - 5) =
= 9x^2 + 15x - 15x - 25
= 9x^2 - 25 (BENAR krn SAMA)
2. (2x - 3)(x + 2) =
= 2x^2 - 3x + 4x - 6
= 2x^2 + x - 6 (SALAH Krn BEDA)
3. (2x + 5)(x - 2) =
= 2x^2 + 5x - 4x - 10
= 2x^2 + x - 10 (BENAR krn SAMA)
4. (X + 2)(x - 3) =
= x^2 + 2x - 3x - 6
= x^2 - x - 6 (SALAH Krn BEDA)