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

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

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New post 08 Jan 2019, 23:34
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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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New post 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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New post 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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The operation denoted by the symbol ♦ is defined for all real numbers

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