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4a^2+8a-20=0 By completing the square
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4a^2+8a-20=0
By completing the square

User Darkwonder
by
8.8k points

2 Answers

6 votes
4a² + 8a - 20 = 0
a = -8 +/- √(8² - 4(4)(-20))
2(4)
a = -8 +/- √(64 + 320)
8
a = -8 +/- √384
 8
a = -8 +/- 19.59591794
8
a = -8 + 19.59591794 a = -8 - 19.59591794
8 8
a = 11.59591794 a = -27.59591794
8 8
a = 1.449489743 a = -3.443813782
User MariusLAN
by
8.2k points
1 vote
I'm not sure but I think it is a=−1±6√
a≈1.44948974,−3.44948974
User Ovasylenko
by
7.5k points
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