exam Maths Puzzle Numerical Ability

factor the polynomial completely 2x^3+18x^2+28x

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exam Other Question

Hi, Can someone assist me with the following problem?
Find the LCM

35c^6a^8,5c^8a^8,14c^4a^6 use the facts:
A=|a b|
|c d|,
then

A^-1=1/ad-bc|d -b|
|-c a| to find the inverse of the matrix, if possible. Check that AA^-1=I(base 2) and A^-1A=I(base2