Question

Which operation should you perform first in the expression 12 × 42?

Answer 1

SOLUTION

TO DETERMINE

The operation to perform first in the expression

$\sf{12 \times 42}$

FORMULA TO BE IMPLEMENTED

We are aware of the formula that

a² - b² = ( a + b) ( a - b)

EVALUATION

$\sf{12 \times 42}$

$\sf{ = (27 - 15) \times (27 + 15)}$

$\sf{ = {(27)}^{2} - {(15)}^{2} }$

$= 729 - 225$

$= 504$

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