Question

7. Simplify the following expressions and find their values when x2:
(1) +7+4(x - 5)​

Answer 1

Hey!!

x + 7 + 4 ( x - 5)

= x + 7 + 4x - 20

= 5x - 13

5 * 2 - 13 = 10 - 13

= -3

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Answer 2

x + 7 + 4 ( x - 5 )

x + 7 + 4x - 20

( x + 4x ) + ( 7 - 20 )

5x - 13

[ already given that x = 2 ]

=> 5 ( 2 ) - 13

=> 10 - 13

=> -3