3 years ago

1. A teacher asked the students to create a formula for the sequence 5, 8, 11, 14, ...

Mathematics

1 answer:

SCORPION-xisa [38]3 years ago

5 0

Good evening ,

Answer:

Is his formula correct and how do you know : Yes

Is it an explicit or recursive formula : explicit

Step-by-step explanation:

an = a1 + (n-1)r

a1 = 5

r = 8-5 = 3

Then an = 5 + 3(n-1).

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For the function: f(x) = 21 + 2x − 5x2 Find f(3)

allochka39001 [22]

F(3)=-18

You just replace x for three for your equation and then use Ofer of operations to solve it.

So f(3)= 21+ 2(3)-5(3)^2

The exponent goes first: f(3)= 21+ 2(3)-5(9)

Next is multiplication: f(3)= 21+ 6-45

Now add: f(3)= 27-45

Finally subtract: f(3)= -18

Hope this helps!

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