exam Maths Puzzle Numerical Ability

X^30/X^-10

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exam Other Question

(3x-2y)^2=
a. 9x^2-4y^2
b. 9X^2+4y^2
c. 9x^2+4y^2-6xy
d. 9x^2+4y^2-12xy How do you solve this problem? or what is the formula for it?