Question

(x+5) (x-5) = ?
a) 2x
b) x2 - 10
c) (x -5)2
d) x2- 25
2x means 2 square
x2 means x square
(x -5)2 square

Answer 1

Answer:

b

Step-by-step explanation:

(x+5)(x-5)

x²-5x+5x-25

x²-25

Answer 2

Step-by-step explanation:

(a+b)(a-b)=a^2-b^2

so

(x+5)(x-5)=x^2-5^2

(x+5)(x-5)=x^2-25