The value of gf(7) = 50
A function is a mathematical statement used to relate two variable , an independent and dependent variable.
It is given that
f(x) = 4x -9
g(x) = 3x² -9x -7
to find
(gf) (7)
g(x)f(x) has to be determined
= (3x² -9x -7)(4x -9)
= 12x³ -27x²-36x²+81x -28x +36
= 12x³ -63x² +53x +36
Now fg(7 ) =
= 12 (7) -63 (7) +53 (7)+36
=50
Therefore the value of gf(7) = 50
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