Առաջադրանք 208
ա) y = 5x — 9
x = 0, y = -9
y = 0, x = 5/9
բ) y = 15 — 3x
x = 0, y = 15
y = 0, y = 5
գ) y = 3x2 — 2x — 8
x = 0, y = 8
y = 0, 3x2 — 2x — 8 = 0
x1 = 2, x2 = — 4/3
դ) y = x2 — 121
x = 0, y = x2 — 121
y = 0, x = — 11, x1 = 11
Առաջադրանք 209
ա) f (x) = 2x — 1, g (x) = 9- 3x
2x — 1 = 9 — 3x
5x — 10, x = 2
բ) f (x) = 5 — x, g (x) = 7 + x
2x = — 2, x = — 1
f (2) = x (2) = 2 x 2 — 1 = 9 — 3 x 2 = 3
Պատ․ ՝ (2;3)
f (-1) — g (-1) = 6
Պատ․ ՝ (-1;6)