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Rewrite equation as:

y2-y-42=0

So you need two numbers that:

multiply to -42 and

add to -1

Those two numbers are: -7 and 6

so to factor you get:

(y-7)(y+6)=0

y=7 y=-6

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Q: How do you solve the quadratic equation 42 equals y2-y by factoring?
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