exam Maths Puzzle Numerical Ability

find three nonzero 2x2 matrices A, B, and C so that AC = BC but A does not equal B.

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exam Other Question

2( x + 4 ) - 5( x - 3 ) = 32 did i do this right?
rounded 2 decimal places the approximate x intercept of the equation x^3+14.2x^2-4.8x-12.4=0
in standard window
i got 53.44??????????????