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stepladder [879]
2 years ago
8

QF Q6.) Find the function for b.

Mathematics
2 answers:
Kay [80]2 years ago
8 0
(g₀f)(x)=g(f(x))
=g(2x-4)
=4(2x-4)^2-3
=4(4x^2-16x+16)-3
=16x^2-64x+61

Dimas [21]2 years ago
7 0
The function notation f(x)=2x-4 means replace the x on the right-hand side with the value in parentheses on the left.
For example, f(y)=2y-4; f(4)=2(4)-4=4; f(1)=2(1)-4=-2 and so on.
The same principle applies to g(x), for example
g(2)=4(2^2)-3=13,
g(x+1)=4(x+1)^2-3=4(x^2+2x+1)-3=4x^2+8x+4-3=4x^2+8x+1
and so on.

(g of f)(x) is another way to write g(f(x)), therefore
g(f(x))
=g(2x-4)   [because f(x)=2x-4
=4(2x-4)^2-3
=4(4x^2-16x+16)-3
=16x^2-64x+64-3
=16x^2-64x+61
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