book Maths Puzzle Numerical Ability

how do i find the x-intercepts for the question 3xsquared plus 5x minus six?

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book Other Question

whatis y=3x-8
y=4-x An experienced carpenter can panel a room 3 times faster than an apprentice can. Working together they can panel the room in 6 hours. How long would it take each one working alone to do the job?