Quadratic Equations By Factoring Worksheet With Answer Key Page 4
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4-3 Solving Quadratic Equations by Factoring
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SOLUTION:
Find the factors of –22 whose sum is –9.
2(–11) = –22 and 2 + (–11) = –9
Write –9x as 2x –11x.
Factor x from the first two terms and –11 from the last two terms.
Factor x + 2 from the two terms.
Therefore,
29.
SOLUTION:
Here, a = 15, b = 7 and c = –2.
ac = 15(–2) = –30
Find two factors of –30 whose sum is 7.
10(–3) = –30 and 10 + (–3) = 7
Write 7x as 10x – 3x.
Factor 5x from the first two terms and –1 from the last two terms.
Factor 3x + 2 from the two terms.
Therefore,
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