exam Maths Puzzle Numerical Ability

Solve the equation.

x(5x+25)=0

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exam Other Question

solve the system using matrices. Use Gaussian elimination iwth back-substitution or Gauss-Jordan elimination:

x-2y-z=2
2x-y+z=4
-x+y-2z=-4 Please help me set up this problem:
A juice drink manufacturer has found mixing cherry juice concentrate & fresh squeezed orange juice is the most cost effective way to produce it