exam Maths Puzzle Numerical Ability

Exponential equation without logs. Solve for x:

(4/5)^(-4x+5)= 64/125

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exam Other Question

I am multiplying fraction Radicals and I dont know how to start the problem. Find the x-intercepts.
y = x^2 + x - 9

I am a little confused on how to find the x intercepts, I am familiar with finding they Y-intercepts but I am not understanding the x-intercepts. Please help. Thanks.