exam Maths Puzzle Numerical Ability

I am lost. If anyone can help I would appreciate it. Thanks
Solve
x^2+7x-1=0

Find the x intercepts of
f(x)=x^2+7x-1

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exam Other Question
will you help me to understand how to solve simple equations such as this one: 2x+3=9.x= x2+12x+0=0