Question

factorise 1 - 2a - 3a^2​

Answer 1

Step-by-step explanation:

a have two value 1/3 and -1

Answer 2

Answer -

• (a + 1) (1 - 3a).

What to do -

• Factorise 1 - 2a - 3a².

Step-by-step explanation -

• We are asked to factorise 1 - 2a - 3a².

$\longrightarrow$ 1 - 2a - 3a²

$\longrightarrow$ 1 - 3a + a - 3a²

$\longrightarrow$ (a + 1) + 3a (a + 1)

$\longrightarrow$ (a + 1) (1 - 3a)

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Verification -

• To check our answer, let's multiply a + 1 with 1 - 3a and see whether we get 1 - 2a - 3a².

$\longrightarrow$ (a + 1) (1 - 3a)

$\longrightarrow$ (a) (1) + (1) (1) + (-3a) (a) + (-3a)(1)

$\longrightarrow$ 1a + 1 + (-3a²) + (-3a)

$\longrightarrow$ 1 - 2a - 3a²

We get 1 - 2a - 3a² on multiplying a + 1 with 1 - 3a.

Hence verified!!

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