Page 17 - Pharmacy College Admission Test Review Book

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Quantitative Ability Answers

Important Mathematical Formulas:

n n!
1. ( ) =
r r!(n−r)!

n!
2. nPr =
(n−r)!

2
3. If ax + bx + c = 0, a ≠ 0, the following equation should be used:

2
−b ± √b −4ac
x =
2a

2
2
4. If ax + bx + c = 0, a ≠ 0, and b -4ac < 0, then the following equation should be used:

2
−b ± i √b −4ac
x =
2a

2
2
5. (a - b ) = (a - b)(a + b)
2
2
6. (a + b) = a + 2ab + b 2
2
2
7. (a - b) = a - 2ab + b 2

8. Distance formula: To find the distance between two points on the line,

2
2
d (P, Q) = √(x − x ) + (y − y )
1
2
1
2

9. Midpoint formula:

M = ( x 2 + x 1 y 2 + y 1 )
,
2 2

10. Square:

A x B
2
A. Area (A) = x , where x = side of square
B. Perimeter (P) = 4x, where x = side of square
P C. The diagonal of every square bisect each other, therefore
x AP = PD and CP = PB
D. The diagonal of every square are congruent, therefore AD
= BC
C D

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