Bonjour,
a. 0 ≤ x ≤ 4
f (x) =3x .
b. 4 ≤ x ≤ 7
f (x) = 12 + x - 4 = x + 12 - 4 = x + 8
c. 7 ≤ x ≤ 10
f (x) = 15 + (x - 7) * 4 = 15 + 4x - 28 = - 28 + 15 + 4x = 4x - 13
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Bonjour,
a. 0 ≤ x ≤ 4
f (x) =3x .
b. 4 ≤ x ≤ 7
f (x) = 12 + x - 4 = x + 12 - 4 = x + 8
c. 7 ≤ x ≤ 10
f (x) = 15 + (x - 7) * 4 = 15 + 4x - 28 = - 28 + 15 + 4x = 4x - 13