3. mckenna was asked to write the following expression in stand
3 - 5(3a + 6)
when writing the expression in standard form, mckenna made a mistake.
3 - 5(3a + 6)
3+(-5)(3a + 6) step 1
-2(3a +6) step 2
-6a +(- 12) step 3
-6a - 12 step 4
a. mckenna made her first mistake in
b. the correct expression in standard form is