exam Maths Puzzle Numerical Ability

simplify (4x)^2

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exam Other Question

Solve for x:
a) 3^x-(4(sqrt3)^x)+3=0
b) 2(^x)-(12(sqrt2)^x)+32=0
c)(27(3)^x)-(12(sqrt3)^x)+1=0
d) 4(2^x)-33(sqrt2)^x)+8=0
Can someone please show me the steps? Graph the equations
a=y=-7
b=x=-5
Show how you got the answer. Any and all assistance in this matter is greatly appreciated in advance.