Question

Factorise these expressions.
a. x^2 – x
b. x^2 – 25
c. x^2 – 5x + 4

Answer 1

Answer:

To factorise , we have to equate the equation with 0 .

a. x² - x = 0

=> x( x - 1 ) = 0

=> x = 0 or x = 1

b. x² - 25 = 0

=> x² = 25

=> x = ±5

=> x = 5 or -5

c. x² - 5x + 4 = 0

=> x² - x - 4x + 4 = 0

=> x( x - 1 ) - 4 ( x - 1 ) = 0

=> ( x - 1 ) ( x - 4 ) = 0

=> x = 1 or x = 4