Question

If x = 3 , y = 2 & z = -3 , then find the value of 7x + 5y - 9z

Answer 1

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$7x + 5y - 9z \\ \\ \\ = 7 \times 3 + 5 \times 2 - 9 \times - 3 \\ \\ \\ = 21 \times 10 \times - 27 \\ \\ \\ = - 5,670$

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Answer 2

Answer

=58

Solution

7x = 21 (7 x 3)

5y = 10 (5 x 2)

9z = -27 (9 x -3)

=21 + 10 - (-27)

=21 + 10 + 27

=58

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