Question

2
Expand i ( 3a+7b-3c)​

Answer 1

Answer:

as all are getting multiplied so it'll be

3*a +7*b-3*c

Answer 2

$\huge \mathscr{\orange {\underline{\pink{\underline {Answer:-}}}}}$

Using Suitable Identity,

(a + b−c)² = a²+b²+c²+2ab −2bc −2ca

(3a+7b-3c)² = 3a² + 7b² + (-3c) + 2(3a)(7b) -2(7b)(-3c) -2(-3c)(3a)

=> 3a² + 7b² -3c + 84ab + 42bc - 18ca

So,

This is the Required Expansion:-

3a² + 7b² -3c + 84ab + 42bc - 18ca