exam Maths Puzzle Numerical Ability

x+2z=4 Step #1 [1 0 2:2]
x+y+z=6 [1 1 1:6]
3x+3y+4z=28 [3 3 4:28]

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exam Other Question

sqrt x3=27

answer:

Show work:
Find the perfect square trinomial whose first two terms are given.
x square + 8x