Explanation: Before we begin, remember the following: a(b+c) = ab + bc
Now for the given: Assume that the first question mark is x and that the second question mark is y.
The expression now becomes: (6a-x) * 5a = ya² - 35a Distribute the 5a over the bracket and equate it with the right-hand side as follows: 5a(6a) - 5a(x) = ya² - 35a 30a² - 5ax = ya² - 35a
By comparison: 30a² = ya² ..............> This means that y = 30 -5ax = -35a -5x = -35 5x = 35 x = 35/5 x = 7
Based on the above, the expression is: 5a * (6a-7) = 30a² - 35a
