exam Maths Puzzle Numerical Ability

How do i calculate the value of the discriminant of x^2+x+3=0

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exam Other Question

How do I solve this system of equation?

i x + y + z = 5
ii 2x − y + z = −2
iii 2x + y + 3z = 6
Tom and David have 480 marbles between them. Tom arranges them in columns with 6 in each column, and David arranges them in columns with 9 in each column. The total number of col