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Solution of an Equation

If m = -7 and...

Question

If m = -7 and n = 1, evaluate 3mn + n.

A

21

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B

-20

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C

20

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D

-21

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Solution

The correct option is B -20
Given; m = -7 and n = 1
Put the value of m and n in given equation = 3mn + n
$\Rightarrow$ $(3 \times (- 7) \times 1] + 1 = - 21 + 1 = - 20$

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Solution of an Equation

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