book Maths Puzzle Numerical Ability

What is the value of j in the equation? kthe square root of j+ the square root of j + 14=3 to the square root of j+10?Please help me?

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book Other Question

how would you solve tjis equation? Square root 4x^2+x-3=2x
I am stuck. can someone please help?
2
_x=-10
5
Two fifths x = -10

i wrote it out incase it did not come out looking right. Can I get help on this.