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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Factor 3 from all the three terms.