exam Maths Puzzle Numerical Ability

P=2L + 2W (for the L)

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exam Other Question
Can you help me double check this using the quad formula?:

x^2 - 10 - 1 = -10 HI, I am having trouble with these question. Any help will be apreciated ;)



What system of equations could your enter on your graphic calculator to solve the exponential equation 6^x-1=7

thanks