Question

-3a(a? – 10a + 25) =

Answer 1

a
2
+
10
a
+
25
Rewrite
25
25
as
5
2
5
2
.
a
2
+
10
a
+
5
2
a
2
+
10
a
+
5
2
Check the middle term by multiplying
2
a
b
2
a
b
and compare this result with the middle term in the original expression.
2
a
b
=
2
⋅
a
⋅
5

Answer 2

`-3a^(3) +30a^(2) -75a`

Explanation:

I'm not sure about the question mark so i thought it might have been an
`a^(2)`.