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(9+y)(9-y)=81-9y+9y-y²
ii. x²-x-12=(x+4)(x+3)
(x+4)(x+3)=x²+3x+4x+12=x²+7x+12
iii. 24y²+6y=6y(4y-1)
6y(4y-1)=24y²-6y
iv. x²+2x-24=(x+6)(x-4)
(x+6)(x-4)=x²-4x+6x-24=x²+2x-24
jadi pernyataan yang benar adalah i dan iv