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Commutative Property of Multiplication

If 15+21=p+15...

Question

If $15 + 21 = p + 15,$ then $p$ is equal to

15

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51

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21

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12

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Solution

The correct option is C $21$
Let's write the commutative property of addition of 15 + 21, we get
$15 + 21 = 21 - - - + 15 15 + 21 = p - + 15 (given)$

By comparing,
$\Rightarrow p = 21$

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x^{2} - 2 P x + 8 P - 15 = 0

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D_{p} = ∣ ∣ ∣ ∣ ∣ \begin{matrix} p & 15 & 8 p^{2} & 25 & 9 p^{3} & 45 & 10 \end{matrix} ∣ ∣ ∣ ∣ ∣

d e t (D_{1} + D_{2})

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q = (15 - 5) - 3,

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