Answer:
4x² +24 x +23
Step-by-step explanation:
f(x) = 4x² +8x -9
f(2+x) = 4(2+x)² +8(2+x) -9
= 4(2²+2.2x +x²) +16 +8x-9
= 16+ 16x + 4x² +16+8x-9
=23+16x+4x²+8x
= 4x² +24x+23
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