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

Sagot :

Hardy007idn
I'm not sure but I think it is a=−1±6√ 
a≈1.44948974,−3.44948974
Panoyinidn
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
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