exam Maths Puzzle Numerical Ability

Solve for x

x with a 2 as the exponent - 6x + 9 = 0

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exam Other Question

Ellie and Ruth make plans to paint the house. Ellie can paint it in 10 hours. Ruth says she can paint it in 6 hours. How long will it take them to paint the house together?
Can you please help with this equation?
Find the roots of 3x^2+2x-4=0.
Thank you so much for your help.