exam Maths Puzzle Numerical Ability

can you explain in a more simpiler way about just sqaure roots?

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exam Other Question

6n2+17n+7 CAN SOMEONE PLEASE HELP ME WITH THIS PROBLEM:
Consider d(x)=(x+2)^3+3; what is the new equation for d(x) if it is 4 times larger?

a. d(x)=4(x+2)^3 +12
b. d(x)=(x+2)^12 + 3
c. d(x)= 4(x+2)^3
d. d(x)=4(x+2)^3 +3