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=5x²-3xy ⇒ benar
(ii)(a-2)(a-2)
=a²-2a-2a+4
= a²+4 ⇒ salah
(iii) (3x-2)(x+3)
=3x²+9x-2x-6
=3x²+7x-6 ⇒ benar
jadi yag enar adlh (i) dan(iii)
(ii) (a - 2) (a - 2) = a² - 2a - 2a + 4
= a² - 4a + 4
a² - 4 ≠ (a - 2) (a - 2)
(iii) (3x - 2) (x + 3) = 3x² + 9x - 2x - 6
= 3x² + 7x - 6
3x² + 7x - 6 = (3x - 2) (x + 3)
Jadi, pemfaktoran yang benar adalah (i) dan (iii)