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Simplifying
(-5a)(-4a) = 0
Remove parenthesis around (-5a)
-5a(-4a) = 0
Remove parenthesis around (-4a)
-5a * -4a = 0
Reorder the terms for easier multiplication:
-5 * -4a * a = 0
Multiply -5 * -4
20a * a = 0
Multiply a * a
20a2 = 0
Solving
20a2 = 0
Solving for variable 'a'.
Move all terms containing a to the left, all other terms to the right.
Divide each side by '20'.
a2 = 0.0
Simplifying
a2 = 0.0
Take the square root of each side:
a = {0.0}
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