Explications étape par étape:
f(x ) = -2x + 3
1) f(1/5) = (-2 × 1/5) + 3 = -2/5 + 3 = -6/15 + 45/15 = 39/15 = 13/5
2) -2x + 3 = 11 -2x = 11 - 3 = 8 x = 8/-2 = -4
3) -2x + 3 = 1/3 -2x = 1/3 - 3 = 1/3 - 9/3 = -10/3
x = -10/3 ÷ -2 = -10/3 × -1/2 = 10/6 = 5/ 3
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Explications étape par étape:
f(x ) = -2x + 3
1) f(1/5) = (-2 × 1/5) + 3 = -2/5 + 3 = -6/15 + 45/15 = 39/15 = 13/5
2) -2x + 3 = 11 -2x = 11 - 3 = 8 x = 8/-2 = -4
3) -2x + 3 = 1/3 -2x = 1/3 - 3 = 1/3 - 9/3 = -10/3
x = -10/3 ÷ -2 = -10/3 × -1/2 = 10/6 = 5/ 3