Question

7.
If a = 3m² - 4n+mn and b= n²-2n +3nm , find the value of:
(a) a-b
(b) 2a-36
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Answer 1

Answer:

$+ x() {xx)y { \frac{9 \\ \\ \\ }{?} }^{?} }^{?} 7 - - - 9639 \sqrt{ < } 9$

Answer 2

Solution :

a = 3m² - 4m + mn

b = n² - 2n + 3mm

Subtracting them ;

a - b = 3m² - 4m + mn - ( n² - 2n + 3mn )

=> a - b = 3 m² - 4m + mn - n² + 2n - 3mn

=> a - b = 3m² - n² - 4m + 2n - 2mn

Answer ( a ) :

a - b = 3m² - n² - 4m + 2n - 2mn

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a = 3m² - 4m + mn

2a = 6m² - 8m + 2mn

2a - 36

=> 6m² - 8m + 2mn - 36 .

Answer ( b ) :

2a - 36 = 6m² - 8m + 2mn - 36 .

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