=7a*4a

Solution for =7a*4a equation:

Simplifying
0 = 7a * 4a

Reorder the terms for easier multiplication:
0 = 7 * 4a * a

Multiply 7 * 4
0 = 28a * a

Multiply a * a
0 = 28a2

Solving
0 = 28a2

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-28a2' to each side of the equation.
0 + -28a2 = 28a2 + -28a2
Remove the zero:
-28a2 = 28a2 + -28a2

Combine like terms: 28a2 + -28a2 = 0
-28a2 = 0

Divide each side by '-28'.
a2 = 0

Simplifying
a2 = 0

Take the square root of each side:
a = {0}