Question

6. Factorise
a. 81x4 - 625y4
b. x2 - 6x - 16​

Answer 1

Step-by-step explanation:

b.) Given,

x² - 6x - 16

-16

| \

-8 +2

x² - 8x + 2x - 16 = 0

x(x-8) +2 (x-8) = 0

(x-8)(x+2) = 0

x-8 = 0 or x+2 = 0

x = 8 or x = -2.