exam Maths Puzzle Numerical Ability

(2x-1)^2=8

x^2-4x+4=49

(8t-3)^2=0

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exam Other Question

Write down the coefficient of the term 4x4y2z in the algebraic expression 4x4y2z - 3x3y2z + 3/2xy3z2.
Please help with this problem I have tried but I don't understand. Please hel can someone PLEASE help me solve this system:
{ x+ y-4z=6
{2x-5y+3z=2
{ x-6y+7z=-4
thank you so much!