exam Maths Puzzle Numerical Ability

I am trying to find the vertex for the following problem:

x^2+3x-4=0

All the help I could get would be appreciated.

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exam Other Question

A beauty shop sells for $75,000 and a 22% down payment is made. A 20-year mortgage at 6.5% is obtained.
o Find the down payment.
o Find the amount of the mortgage. Find the sqaure root of 44-2x=x-10