Question

Multiply ( 3x - y ) by ( x + y ) and verify the result for x = 1 and y = ( -2). ​

Answer 1

Answer:

use formula (a-b) (a+b) a2-b2

Step-by-step explanation:

you will get answer hope this will help you if it follow me

Answer 2

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Question :-

Multiply ( 3x - y ) by ( x + y ) and verify the result for x = 1 and y = ( -2).

Answer :-

$3x(x + y) - y(x + y) \\ \rightarrow3x \times 2 + 3xy - xy - y \times 2$

$\rightarrow3x \times 2 + 2xy - y \times 2$

Verification by applying x = 1 and y = (-2)

$\rightarrow3(1) \times 2 + 2(1)( - 2) - ( - 2) \times 2$

$\rightarrow3 + ( - 2) + 4$

$\rightarrow3 + 2 \\ \rightarrow5$

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