PRE-CAL MATH TEST SOLUTIONS |
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1)Test the following to see if they are functions. If they are
i) state one-to-one or many-to-one | ii) state the domain. |
If they're not, say why.
a) x = y^{ 2} not a function since |
b) y = x^{2} - 3x - 28 a function, many-to-one domain is R |
c) y = a 1-1 function domain R but x ! 10 |
d) f(x) = not a function same reason as a) |
e) y = x is a 1 to 1 function domain R. |
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2) Write the equation of the line:
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3) State the slope, y-intercept and x-intercept of 2x + 3y =24
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B/ 1) f(x) = 2x^{2} - 60x + 25
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2) Find the x-intercepts or ZEROS (if any) for:
a) y = x^{2} - 5x x(x - 5) = 0 x = 0 or x = 5 |
b) y = x^{2} - 4x - 21 (x - 7)(x + 3) = 0 x = 7 or x = - 3 |
c) y = x^{2} - 4x + 5 it doesn't factor, use quadratic formula b^{ 2} - 4ac = -4 < 0, no roots, min k = 1 |
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3) A farmer has 60 meters of fencing to enclose a rectagular field along a riverbank.
The side along the river needs no fence since his cows can't swim.
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