Question

Expand (3a - 5b + c). can anyone answer please

Answer 1

by the way

THERE IS SOME MISTAKE INUR QUESTION

Heya !!

Here's your answer

To expand

(3a - 5b - c)²

It can be expanded using algebraic identity

(a + b + c)² = a²+ b²+ c² + 2ab + 2bc + 2ac

where,

a = 3a

b = (-5b)

c = ( -c)

So,

(3a +(-5b)+(-c)² = (3a)² + (-5b)² + (-c)² + 2(3a)(-5b) + 2(-5b)(-c) + 2(3a)(-c)

= 9a² + 25b² + c² - 30ab + 10bc - 6ac

is the answer

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Answer 2

Step-by-step explanation:

Hey Friend ☺

( 3a - 5b - c ) ^2

Using identity ( a + b + c )^2 = a^2 + b^2 + c^2 + 2 ( ab + bc + ac )

Here a = 3a , b = - 5b , c = - c

so

( 3a - 5b - c )^2

= ( 3a )^2 + ( - 5b )^2 + ( - c )^2 + 2 [ ( 3a )( - 5b ) + ( - 5b )( - c ) + ( 3a )( - c )

= 9a^2 + 25b^2 + c^2 + 2 ( - 25ab + 5bc - 3ac )

= 9a^2 + 25b^2 + c^2 - 50ab + 10bc - 6ac

Hope it helps you ..!!

✌