exam Maths Puzzle Numerical Ability

What do I solve this by factoring?

49x^2 - 14x - 3

Thanks!

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exam Other Question

a man rode a bycycle for 12 miles then hiked an additional 8 miles . the total time for the trip was 5 hrs . if the rate when he was riding his bicycle was 10 miles per hour faster than his rate walking , what was each rate 8x-y=17
6x+y=11

Find the value of the variables......

Please help, I keep coming up with a fraction.

Thank you!

Amanda