CPM Homework Help : PC Problem 6-75

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6-75.

Solve the following equations.

$x^{2} − 4x = 21$
Hint (a):
1. Set everything $= 0$
2. Factor or use the quadratic formula.
3. How many answers should you have?

$3 + \frac { 1 } { x } = \frac { 10 } { x ^ { 2 } }$
Hint (b):
Set the entire function $= 0$ .

$\left(x − 2\right)\left(x + 1\right) = 4$
Hint (c):
Multiply each term by $x^{2}$ .

$\sqrt { 6 x ^ { 2 } + 5 x } = 5$
Hint (d):
Square both sides first.

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