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

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The operation denoted by the symbol ♦ is defined for all rea [#permalink]  08 Jan 2019, 10:40
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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) $$21$$
[Reveal] Spoiler: OA

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Re: The operation denoted by the symbol ♦ is defined for all rea [#permalink]  09 Jan 2019, 04:28
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Carcass 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) $$21$$

Explanation::

$$p \blacklozenge r = pr - p + r = (-4)(5) - (-4) + 5$$ = -20 + 9 = -11
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Re: The operation denoted by the symbol ♦ is defined for all rea   [#permalink] 09 Jan 2019, 04:28
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# The operation denoted by the symbol ♦ is defined for all rea

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