2x+8y in factor form is 2(x+4y)
8 is a rational number and 49 is a rational number and three is true
The answer is 3.72 is you are dividing. If you are multiplying the answer is 372
The answer is 4a²x² + 2abx² + 1/4b²x².
This is the square of the sum. The general formula is:
(m + n)² = m² + 2mn + n²
In our case, m = 2ax and n = 1/2bx.
So:
(2ax + 1/2 bx)² = (2ax)² + 2 * 2ax * 1/2bx + (1/2bx)² =
= 4a²x² + 4/2abx² + 1/4b²x² =
= 4a²x² + 2abx² + 1/4b²x²
Just do 218 x 3 = 654 because that's three times more in may than you add 654 + 218 to get 872.