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At the x-intercepts of the graph, the line crosses the x-axis. This means that the y-value at these points equals 0. We must therefore make x^2+2x equal to 0 and simplify the equation. x^2+2x = 0 is the s...

A production possibility frontier, or PPF, is a line showing the maximum level of output in an economy of one good or group of goods in terms of another. At any point on this line, the economy is operatin...

In German, there are 3 ways of forming the past tense. The easiest 2 are the Perfect and Imperfect, and there is another slightly more complex form calle...

Let James = x 

Mike = x+8

Sam = Mike+5 = (x+8)+5 = x+13

Altogether: James + Mike + Sam = 72

Therefore, x + (x+8) + (x+13) = 72

Now solve for x: 3x + 21 = 72

Bring...

To begin you must identify the co-efficients of each x term, essentially what number comes before x² , x and the integer value.

a = 1, b = 3, c = -4 . We then substitute these values int...