Answer:
-59a^2 + 60a - 22
Explanation:
Remember the formula: (a-b)^2 = (a^2 - 2ab + b^2)
Expand the parentheses: (2-5a)^2
(4 - 20a + 25a^2)
Add it back into the expression and distribute the 3.
16a^2 - 3 (4 - 20a +25a^2) -10
16a^2 - 12 + 60a - 75a^2 -10
Combine like terms
-59a^2 + 60a - 22