Mathematics for IGCSE & O level - Algebraic Manipulation (Section 7 - No. 15)
What is the result of expanding (x + 5)^2?
x^2 + 25
x^2 - 25
x^2 + 10x + 25
x^2 - 10x + 25
解释
(x+5)^2 is equivalent to (x+5)(x+5). Applying the FOIL method results to x^2 + 10x + 25