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What is the value of 4^5+4^7?

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Math Expert
Joined: 02 Sep 2009
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What is the value of 4^5+4^7?  [#permalink]

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25 Oct 2019, 02:14
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What is the value of $$4^5+4^7$$?

(A) $$4^{12}$$
(B) $$4^{35}$$
(C) $$17(4^5)$$
(D) $$8^{12}$$
(E) $$7(4^5)$$

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What is the value of 4^5+4^7?  [#permalink]

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25 Oct 2019, 03:09
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$$4^5+4^7=4^5(1+4^2)=4^5(1+16)=17(4^5)$$

Answer is (C)

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Intern
Joined: 31 Aug 2019
Posts: 3
Location: Canada
Re: What is the value of 4^5+4^7?  [#permalink]

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27 Oct 2019, 20:24
4^5 + 4^7

First we can factor out 4^5 and we are left with;

4^5(1 + 4^2)

Then we can compute 4^2, which is 16.

4^5(1 + 16)

the result is;

4^5(17)
Intern
Joined: 28 Jan 2019
Posts: 39
GMAT 1: 730 Q47 V42
Re: What is the value of 4^5+4^7?  [#permalink]

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26 Nov 2019, 08:26
Whenever you have addition or subtraction of same bases raised to different exponents, try factoring out the least common exponent.

4^5+4^7 = 4^5(1+4^2)
=4^5(17)
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Re: What is the value of 4^5+4^7?  [#permalink]

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02 Dec 2019, 19:41
Bunuel wrote:
What is the value of $$4^5+4^7$$?

(A) $$4^{12}$$
(B) $$4^{35}$$
(C) $$17(4^5)$$
(D) $$8^{12}$$
(E) $$7(4^5)$$

Simplifying, we have:

4^5(1 + 4^2) = 4^5(17)

Answer: C
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Intern
Joined: 22 Jun 2017
Posts: 8
Re: What is the value of 4^5+4^7?  [#permalink]

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03 Dec 2019, 15:47
Someone could explain me in details how is the process of factoring out the least common of an exponent?
I tried to figure out by myself but didn't find any theoretical material
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Re: What is the value of 4^5+4^7?  [#permalink]

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07 Feb 2020, 22:09
Bunuel wrote:
What is the value of $$4^5+4^7$$?

(A) $$4^{12}$$
(B) $$4^{35}$$
(C) $$17(4^5)$$
(D) $$8^{12}$$
(E) $$7(4^5)$$

$$4^5+4^7$$
$$4^5(1+4^2)$$
$$17*4^5$$

Option C
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Re: What is the value of 4^5+4^7?   [#permalink] 07 Feb 2020, 22:09
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