Question

Find the value of (p - 1) if p /4 =20​

Answer 1

Answer:

p-1=79

Step-by-step explanation:

p/4=20

p=20×4=80

p-1=80-1=79

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Answer 2

Answer:

Given equation

p(p−1)−20=0

p

2

−p−20=0

a=1b=−1c=−20

b

2

−4ac

=(1)

2

−4(1)(−20)

=1+80

=

81

=9

∴ The roots are real and distinct.

p

2

−p−20=0

p

2

−5p+4p−20=0

p(p−5)+4(p−5)=0

(p+4)(p−5)=0

p=4or5

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