MathsGee is Zero-Rated (You do not need data to access) on: Telkom |Dimension Data | Rain | MWEB

1 like 0 dislike
24 views
Evaluate the following expression and write the answer as a single number without exponents.

$- {6^2} + 4 \cdot {3^2}$
| 24 views

0 like 0 dislike
There is not really a whole lot to this problem. All we need to do is the evaluations recalling the proper order of operations. $- {6^2} + 4 \cdot {3^2} = - 36 + 4 \cdot \left( 9 \right) = - 36 + 36 = 0$

Be careful with the first term and recall that, $- {6^2} = - \left( {{6^2}} \right) = - \left( {36} \right) = - 36$

If we&rsquo;d wanted the minus sign to also get squared we&rsquo;d have written, ${\left( { - 6} \right)^2} = 36$

Always remember to be careful with exponents. The only thing that gets the exponent is the number/term immediately to the left of the exponent. If we want to include minus signs on numbers with exponents then we need to add in parenthesis.
by Diamond (75,934 points)

0 like 0 dislike