Question

If f(x)=7x-7 what is f(8)+f(4)

Answer 1

Given Function is

• f ( x ) = 7x - 7 ------- eqn ( 1 )

Now , put the value of x = 8 in eqn ( 1 )

• f ( 8 ) = 7 ( 8 ) - 7
• f ( 8 ) = 56 - 7
• f ( 8 ) = 49 ------- eqn ( 2 )

Now , put the value of x = 4 in eqn ( 1 )

• f ( 4 ) = 7 ( 4 ) - 7
• f ( 4 ) = 28 - 7
• f ( 4 ) = 21 ------- eqn ( 3 )

From eqn ( 2 ) nd eqn ( 3 ) we get,

• f ( 8 ) + f ( 4 )
• 49 + 21
• 70

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