Mathematics for IGCSE & O level - Algebraic Manipulation (Section 8 - No. 23)
Which of the following is the factored form of x²-16?
(x+4)(x+4)
(x-4)(x-4)
(x-8)(x+2)
(x-4)(x+4)
Vysvětlení
x²-16 can be factored into (x+4)(x-4), which is the difference of two squares.