book Maths Puzzle Numerical Ability

Can you explain how to solve 8x^2-6x-9=0?

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book Other Question

how would you solve a problem such as -7a=-12a-65? i dont understand this

josh A pie-shaped (triangular) lake-front lot has a perimeter of 1000 ft. One side is 100 ft longer than the shortest side, while the third side is 300 ft longer than the shortest side. Find the lengths of all three sides.