f(x) = 6x + 2x × x²
f(3) = 6.3 + 2.3 × 3²
= 18 + 6 × 9
= 72
==========
f(4) = 6.4 + 2.4 × 4²
= 24 + 8 × 16
= 152
=============
f(3) + f(4)
= 72 + 152
= 224
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f(x) = 6x + 2x × x²
f(3) = 6.3 + 2.3 × 3²
= 18 + 6 × 9
= 72
==========
f(x) = 6x + 2x × x²
f(4) = 6.4 + 2.4 × 4²
= 24 + 8 × 16
= 152
=============
f(3) + f(4)
= 72 + 152
= 224