Question

factorise x square- 15​

Answer 1

Answer:

(x + √15) (x - √15)

Explanation:

(x2 - 15)

= (x2 - √15 × √15)

[Since 15 = √15×√15]

= (x2 - (√15)^2)

= (x + √15) (x - √15)

[a2 - b2 = (a+b)(a-b)]