Question

consider the real function f(x)=1-2x
1)find f(-1)and f(2)
2)find x if f( )n=-1​

Answer 1

Using the defined function, f(a) will produce the same result when substituted for x:

f(a) = a2 – 5

Setting this equal to 4, you can solve for a:

a2 – 5 = 4

a2 = 9

a = –3 or 3

Answer 2

Answer:

1) f ( -1 ) = 3 and f ( 2 ) = - 3

2) x = 1

Step-by-step explanation:

NOTE :

• + * + = +
• - * - = +
• + * - = -
• - * + = -

f ( x ) = 1 - 2x

f ( -1 ) = 1 - 2 ( -1 ) [substitute -1 in the place of x]

f ( -1 ) = 1 + 2

f ( -1 ) = 3

f ( x ) = 1 - 2x

f ( 2 ) = 1 - 2 ( 2) [substitute -1 in the place of x]

f ( 2 ) = 1 - 4

f ( 2 ) = - 3

Find x if f(x)=-1

f ( x ) = 1 - 2x

=> - 1 = 1 - 2x

=> 2x = 1 + 1

=> 2x = 2

=> x = 2/2 = 1

Hence if the value of x = 1 then f (x) = -1