exam Maths Puzzle Numerical Ability

Please help me in solving the quadratic equation x^2 - 7x + 12 = 0. Show all steps.

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exam Other Question

1)solve 9*6t=9/36
2) solve In p=6.0
3) using the formula R-0.17 + 0.44 log N, determine how many choices would result in a reation time of 0.42 seconds. Round your answer to the nearest whole number. Graph the solution set to the following system of inequalities:
y>=x^2-1
y<=-x+2