exam Maths Puzzle Numerical Ability

Please help me solve this equation:
9t^2 - 24t + 16 = 0

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exam Other Question

Determine whether each ordered pair is a solution of the system

(-5,2)
2x+3y=-4
x-4y=-10

Please help me out on this

Thanks the quadratic formula is x=-b+(rad)(b^2-4ac)/2a with a line under the +.use it to find the roots of x^2-4x-6=0. please help.