exam Maths Puzzle Numerical Ability

Solve for x:10^x^2 - x = 100

Please show me the steps to get to the answer, which is x = -1 or 2

Cheers my friend

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exam Other Question

Okay, I know I need to do cross cancelation, but when doing that you do not mess with the exponents do you?
2x^5/7y^2 X 21y^11/5x^9 I need help with Matrix and the directions in the book say "Find the product. If it is not defined, state the reason.
The matrix is [7.3 1.5
1.8 0 [-4.2 2.6 -8.7]
2.9 3.2]