exam Maths Puzzle Numerical Ability

Solve for x algebraically: 5^(2x)- 4(5)^x=-3

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exam Other Question

solve using the quadratics formula

rSQUARED+16r+21=0
Find the x-intercepts and y intercepts for f(x)
f(x)=x^2-8x+11

I dont know is this is correct, i got the x intercepts are (4(+-) sqrt5/2,0)