C.
If 3m - 5n =-1 and 2m =n - 3,
find the value of (3m +5n) (m +2 n)
Ans:
Answers
Answered by
0
Answer:
I think your answer is 67.4694
Answered by
2
Answer:
44
Step-by-step explanation:
3m - 5n = -1 × 2
2m - n = -3 × 3
6m - 10 = -2
6m - 3n = -9 ( subtract the equation )
- + +
___________
-7n = 7
n = -1
substitute value of n in the equation
2m - n = -3
2m + 1 = -3
2m = -4
m = -2
Substitute the value of m and n in the given equation
= ( 3m + 5n )( m + 2n )
= ( 3 (-2) + 5 (-1) ) ( (-2) + 2(-1) )
= (- 6 - 5 )(- 2 - 2 )
= ( -11 ) ( -4 )
= 44
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