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# The operation denoted by the symbol ♦ is defined for all real numbers

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Math Expert
Joined: 02 Sep 2009
Posts: 52294
The operation denoted by the symbol ♦ is defined for all real numbers  [#permalink]

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08 Jan 2019, 23:34
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Difficulty:

15% (low)

Question Stats:

100% (00:41) correct 0% (00:00) wrong based on 12 sessions

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The operation denoted by the symbol $$\blacklozenge$$ is defined for all real numbers p and r as follows. $$p \blacklozenge r = pr - p+ r$$ What is the value of $$(-4) \blacklozenge 5$$ ?

(A) $$- 9$$

(B) $$- 11$$

(C) $$- 19$$

(D) $$19$$

(E) $$21$$

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Re: The operation denoted by the symbol ♦ is defined for all real numbers  [#permalink]

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08 Jan 2019, 23:46
Bunuel wrote:
The operation denoted by the symbol $$\blacklozenge$$ is defined for all real numbers p and r as follows. $$p \blacklozenge r = pr - p+ r$$ What is the value of $$(-4) \blacklozenge 5$$ ?

(A) $$- 9$$

(B) $$- 11$$

(C) $$- 19$$

(D) $$19$$

(E) $$21$$

IMO B

Substitute the values and apply BODMAS

-20 + 4 + 5
-11
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Re: The operation denoted by the symbol ♦ is defined for all real numbers  [#permalink]

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09 Jan 2019, 01:27
Bunuel wrote:
The operation denoted by the symbol $$\blacklozenge$$ is defined for all real numbers p and r as follows. $$p \blacklozenge r = pr - p+ r$$ What is the value of $$(-4) \blacklozenge 5$$ ?

(A) $$- 9$$

(B) $$- 11$$

(C) $$- 19$$

(D) $$19$$

(E) $$21$$

substitute and solve as per given function
-4*5 +4 +5
= -11
IMOB
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Re: The operation denoted by the symbol ♦ is defined for all real numbers &nbs [#permalink] 09 Jan 2019, 01:27
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