Question

1) Factorize : 1 - 18z - 63z²?​

Answer 1

Answer:

(1-21z)(1+3z)

Step-by-step explanation:

1 - 18z - 63z2

Factors are : 21 and 3

1- 18z - 63z2

= 1 - 21z + 3z - 63z2

= 1(1 - 21z) + 3z(1 - 21z)

= (1-21z)(1+3z)

Answer 2

$\underline{ \huge\bf\red{QuestiØn} :}$

Factorise :-

• $1 - 18z - 63 {z}^{2}$

$\underline{ \: \huge\bf\green{SolutiØn} \: :}$

We have,

$\begin{aligned} \\ & \qquad \ 1 - 18z - 63 {z}^{2} \\ \\ & = - (63 {z}^{2} + 18z - 1) \\ \\ & = - [63 {z}^{2} + (21 - 3)z - 1 ] \\ \\ & = - (63 {z}^{2} + 21z - 3z - 1) \\ \\ & = - [21z(3z + 1) - 1(3z + 1)] \\ \\ & = - (3z + 1)(21z - 1) \\ \\ & = (3z + 1) [ - ( 21z - 1)] \\ \\ & = \boxed{ (3z + 1)(1 - 21z)} & & \end{aligned}$

$\red{\rule{5.8cm}{0.02cm}}$

$\mid \underline{\underline{\LARGE\bf\green{Brainliest \: Answer}}}\mid$

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