(xy - 4) ^2 + (2x+2y)^2
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(a-d)/2c=b
b-squared plus 5b plus 1 is an expression: not an equation or inequality. There is, therefore, nothing that can be solved. Second, the expression does not have real factors. It makes no sense to use product (factor) and sum to find complex factors. Using the quadratic formula or completing the squares are far simpler.
d=a-2bc
Gathering like terms together, this can be rewritten: 9a = 180 Dividing both sides of the equation by 9: a = 20
Triangles or squares or hexagons. There are also mixtures, like octagons plus squares.