Quadratic Equations By Factoring Worksheet With Answer Key Page 5

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Therefore,
 
4-3 Solving Quadratic Equations by Factoring
31. 
 
SOLUTION:  
Here, a = 18, b = 15 and c = –12.
 
ac = 18(–12) = –216
 
Find two factors of –216 whose sum is 15.
 
24(–9) = –216 and 24 + (–9) = 15
 
Write 15x as 24x + (–9)x.
 
 
Factor 6x from the first two terms and –3 from the last two terms.
 
 
Factor 3x + 4 from the two terms
.
 
Therefore,
 
 
33. 
 
SOLUTION:  
2
2
Use the identity a
– b
= (a + b)(a – b)
 
 
Therefore,
 
35. 
 
SOLUTION:  
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Page 5
Factor 3 from all the three terms.
 

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