this is one of the questions on my take home test i need help. please help me.
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By "combine" I'm guessing you mean subtraction, because no other simple operation makes sense.
x * y = 1640
x + 1 = y
x(x+1) = 1640
You could solve this by the quadratic equation, or by guessing factors. Note that x must be pretty close to √1640, which in turn is close to √1600 = 40. So you're looking for factors near 40. In fact, my first guess would be 40.
1640 = 40 * 41
x * y = 1640
x + 1 = y
x(x+1) = 1640
You could solve this by the quadratic equation, or by guessing factors. Note that x must be pretty close to √1640, which in turn is close to √1600 = 40. So you're looking for factors near 40. In fact, my first guess would be 40.
1640 = 40 * 41
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x + y = 1
y = 1 - x
xy = 1640
x(1 - x) = 1640
x - x^2 = 1640
0 = x^2 - x + 1640
(1 ± √-6559) / 2
x = (1 ± i√6559) / 2
y = 1 - (1 ± i√6559) / 2
both are imaginary complex numbers
y = 1 - x
xy = 1640
x(1 - x) = 1640
x - x^2 = 1640
0 = x^2 - x + 1640
(1 ± √-6559) / 2
x = (1 ± i√6559) / 2
y = 1 - (1 ± i√6559) / 2
both are imaginary complex numbers