If f(x) = 5x + 40, what is f(x) when x = –5? –9 –8 7 15
2 answers:
Answer:
is equal to 15 when
Step-by-step explanation:
Given a function this means that the function ''f'' depends on the variable ''x'', If you want to obtain the value of
when
,being ''a'' a possible value of x (this means ''a'' is in the domain of
) you only need to replace
in the
equation
If ⇒
this means that when
the function value is
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In short, if the denominator is a decimal or a fraction and you have an integer in the numerator, the numerator gets blown up.
so if you divide by 1/2, the numerator blows up to twice as large, if you divide by 1/5, to five times as large, if you divide by 1/3... well, let's see,
why is that? well, you're dividing, and so is saying "how many times 1/3 goes into 2"?
well, 1/3 + 1/3 + 1/3 = 3/3 or 1, so in 1 whole, the fraction goes there 3 times, so in 2 wholes, it'll be 6 times.
so if you divide by 1/2, the numerator blows up to twice as large, if you divide by 1/5, to five times as large, if you divide by 1/3... well, let's see,
why is that? well, you're dividing, and so is saying "how many times 1/3 goes into 2"?
well, 1/3 + 1/3 + 1/3 = 3/3 or 1, so in 1 whole, the fraction goes there 3 times, so in 2 wholes, it'll be 6 times.