exam Maths Puzzle Numerical Ability

I need help writing a binomial expansion for this expression...

(m+n^2)^4

Thank you in advance to anyone that can help me.

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exam Other Question

How Do You Fully Factorise y squared-7x+10?
I Have Gotten As Far As y squared -5x-2x+10 I need help with these two matrice problems- solving it by the Gaussian elimination method:
problem 1.)2x + y - 3z =1
3x - y + 4z =6
x + 2y - z =9