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Solve by factoring p^2-4p=21
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3 votes
Solve by factoring p^2-4p=21

User Colm Prunty
by
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2 Answers

6 votes

solve by factoring

p^2-4p=21

A.
p = (1)/(2), or 21

B.
p = 3, or 7

C.
p = -3, or 7

D.
p = 3, or -7

The Answer is C... p = -3, or 7

User Mojtaba Yeganeh
by
8.5k points
6 votes

p^2-4p=21 \\ p^2 - 4p-21 = 0 - set the equation equal to 0

(p + 3)(p-7) = 0 - factor

p +3=0 \\ p=-3 - one answer

p-7 = 0 \\ p=7 - Second answer
User CantGetANick
by
9.0k points
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