exam Maths Puzzle Numerical Ability

Solve x^2 + 7x - 1 = 0

Can anyone help me out with this please? Thanks so much

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exam Other Question

A company ships computer components in boxes that contain 30 items. Assume that the probability of a defective computer component is 0.2. Use the geometric variance to find the variance of the defective parts. 1)A poker player is dealt three spades and two hearts. He discards the two hearts and draws two more cards. What is the probability that he draws two more spades?
2)A system has