exam Maths Puzzle Numerical Ability

How do I use the quadratic formula to solve: 1.4x^2-2x-10=0

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exam Other Question

Carla has and auto loan for 72 months with an APR of 8.74%. There is 45 months left on the auto loan with an accumulation of $3.77 dollars a day and interest paid so far is 3868.93 i need step by step solution using elimination method,thank u

3x+4y=-15
3x+6y=-21