1 Find the product of the sum of 57 and -32 and the difference of -32 from 57.

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Solution

Answer :

Sum of 57 and -32 = 57 + ( - 32 ) = 57 - 32 = 25
And
Difference of -32 from 57 = 57 - ( - 32 ) = 57 + 32 = 89

So,

Product of these number = 25 $\times$ 89 = 2225 ( Ans )

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Choose the correct answer

If the sum of two numbers is 84 and their difference is 30, the numbers are:

A. −57 and 27

B. 57 and 27

C. 57 and −27

D. −57 and −27

a_{1} = 12

a_{32} = 40

A = ⎡ ⎢ ⎣ \begin{matrix} 1 & 2 & 3 1 & 1 & 5 2 & 4 & 7 \end{matrix} ⎤ ⎥ ⎦

a_{31} A_{31} + a_{32} A_{32} + a_{33} A_{33}

a_{23}, a_{32} and a_{13}

A = (a_{ij}] = ⎛ ⎜ ⎝ \begin{matrix} 5 & 6 & 7 5 & 2 & 3 4 & 8 & 9 \end{matrix} ⎤ ⎥ ⎦ .

A_{i j}

a_{i j}

⎡ ⎢ ⎣ \begin{matrix} 2 & - 3 & 5 6 & 0 & 4 1 & 5 & - 7 \end{matrix} ⎤ ⎥ ⎦

a_{32} . A_{32} .

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