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frozen [14]
3 years ago
7

Given that ƒ(x) = x² + 4x, evaluate ƒ(-2)

Mathematics
2 answers:
mafiozo [28]3 years ago
7 0
f(x)= x^{2} +4x \\ f(-2)= (-2)^{2} +4(-2) \\ =4-8 \\ =-4
Amiraneli [1.4K]3 years ago
3 0
F(-2)=(-2)2+4(-2)
4-8
-4
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Step-by-step explanation:

for this question we can look at the whole answer for the square root of 120 which equals 10.9544511501

\sqrt{120} = 10.9544511501

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10.9544511501

but to find the nearest whole number we have to round the place value BEFORE our whole number. (in this case the 9)

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we can now look at this highlighted section of our equation and think... is 10.9  closer to 11 or 10. well logically, to get to 11 from 10.9 we only have to go up by 0.1, rather than to get to 10, where you have to subtract 0.9.

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But to make it easier, remember the rule:

the place value one place to the RIGHT of what you're rounding to, is what determines the new number. (in this case the .9)

and as any number 5 or above rounds up, we can say that our new number, rounded to the nearest whole number equals 11

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