Question

Factorise x^3+2x^2-x-2​

Answer 1

Step-by-step explanation:

Given that x3 – 2x2 – x + 2

Grouping the 1st and 3nd terms together and the 2nd and 4th term together:

= x(x2 – 1) – 2(x2 – 1)

x3 – 2x2 – x + 2 = (x2 – 1) (x – 2)

Using the identity: a2 − b2 = (a + b) (a- b)

∴ (x2 – 1) = (x + 1)(x – 1)

= (x – 1) (x + 1) (x- 2)

∴ answer is (x – 1) (x + 1) (x- 2)

Example ↑

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Answer 2

Step-by-step explanation:

Coronavirus disease (COVID-19) is an infectious disease caused by a newly discovered coronavirus.

Most people who fall sick with COVID-19 will experience mild to moderate symptoms and recover without special treatment.