book Maths Puzzle Numerical Ability

Find the value of x in the equation
The square root of x+5=the square root of x+45?

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book Other Question

List all of the potential rational zeros of the polynomial function. Do not attempt to find the zeros.

f(x)=5x^3+2x^2-2x+5 what is the soultion to this simultaneous equation using substion or addtion method
x+2y=15
x-2y=-9