f(x) = 3x + 5 Work out a if f(a)= -13

Question

f(x) = 3x + 5
Work out a if f(a)= -13

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RobertKer 3 months 2021-07-19T22:09:03+00:00 2 Answers 2 views 0

Answers ( )

    0
    2021-07-19T22:10:36+00:00

    Answer:

    a = -6

    Step-by-step explanation:

    see, x has been replaced by a.

    so f(a) = 3a + 5 . . . . . . . (i)

    a displaces x from it’s every position in the equation.

    and it’s given that f(a) = -13

    putting f(a) = -13 in equation (i) :-

    3a + 5 = -13

    • taking like terms to one side

    3a = -18

    • dividing the equation by 3

      \blue{ \implies}\mathfrak  { \red  { \underline{  \: a =  - 6 } } }

    0
    2021-07-19T22:10:55+00:00

    Answer:

    a = – 6

    Step-by-step explanation:

    Given

    f(x) = 3x + 5 , then

    f(a) = 3a + 5 and f(a) = – 13 , then equating the right sides

    3a + 5 = – 13 ( subtract 5 from both sides )

    3a = – 18 ( divide both sides by 3 )

    a = – 6

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