Question

If x = -2, y= 7, z = 4 Find the values of the following..

i) 3x + 2

ii) 5x - 7y + 3

iii) 5x² - y² + xy + 1

Show with process and method....

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Answer 1

Answer:

Given data

x=-2

y=7

z=4

• 3x+2

=3*-2+2

=-6+2

=-4

• 5x-7y+3

=5 *-2-7*7+3

=-10-49+3

=-62

• 5x² - y² + xy + 1

=5 * - 2*-2-7*7+-2*7+1

=-42

Answer 2

x = -2

y = 7

z= 4

1) 3x+2

= -6 +2

= -4

2) 5x -7y +3

= -10-49+3

= -39+3

= -36

3)5x²-y²+xy+1

= 5×-2²-7²-2×7+1

=5×4-49-14+1

=20-49-14+1

= -42

hope it helps..

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