exam Maths Puzzle Numerical Ability

Solve the equation. Check for extraneous solutions.
4-x= square root of 10-3x.

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exam Other Question

Please so me how to solve..-4 with 2 as an exponent +1 with 3 as an exponent + -15 with 0 as an exponent. I tried -4x-4=16 + 1x1x1=1 + -15 with 0 exponent would be 1? 16+1+1=18 but this answer is wrong book says answer is -14 please help. what is y when (2, -15), (5, y), m= 4/5