Presumably this is a quadratic equation question in the form of:
a2+0.7a-0.1 = 0
Using the quadratic equation formula will give you:
(a+0.8216990566)(a-0.1216990556) = 0
Therefore: a = -0.8216990566 or a = 0.1216990566
Check that your answer is correct by multiplying out the brackets you should end up with: a2+0.7a-0.1 = 0
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