Consider the functions f(x) = 13x2 and g(x) = 7x − 5. What is the value of (f + g)(5)?

325

9750

355

295

Question

Consider the functions f(x) = 13x2 and g(x) = 7x − 5. What is the value of (f + g)(5)?

325

9750

355

295

kropot72 · Answer

To solve this you need to substitute 5 for x in both equations and add the results. Do you want me to help?

anonymous · Answer

yes, please!

kropot72 · Answer

Substituting 5 for x in the first equation gives:
$$f(x)=13x ^{2}$$
$$f(5)=13\times 5^{2}=you\ can\ calculate$$

anonymous · Answer

i got 325

kropot72 · Answer

That is correct. Now for the second equation:
$$g(x)=7x-5$$
$$g(5)=(7\times 5)-5=you\ can\ calculate$$

anonymous · Answer

30?

kropot72 · Answer

Correct!
$$(f+g)(5)=325+30=?$$

anonymous · Answer

335?

kropot72 · Answer

Not really. 
325 + 30 = ?

anonymous · Answer

I thought it was 335

kropot72 · Answer

Have you tried adding on a calculator 325 + 30?

anonymous · Answer

yes

kropot72 · Answer

What was the result on the calculator?

anonymous · Answer

355. Oh sorry! I see what i did.

kropot72 · Answer

Yes, the correct choice is 355.

anonymous · Answer

can u help me with 4 more similar questions?

kropot72 · Answer

Sorry, I need to log out now. Please post your questions and others can help you.

anonymous · Answer

ok