Algebra and Applications Test 2

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Question : 28 of 40

Marks: +1, -0

When is the expression

f ^2 + 3f - 10

positive only?

$f ≤ - 5$
$f ≥ 2$
$- 5 < f < 2$
$f < - 5 \or f > 2$
None of these

Solution:

f ^2 + 3f - 10=(f+5)(f-2)

∴ f ^2 + 3f - 10

will be positive, if

f < - 5 \or f > 2

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