Math, asked by salome14, 6 months ago

x2-x-20= what is the answer

Answers

Answered by sangitajugran96
1

Answer:

22x is rhe answer

Step-by-step explanation:

hope it helps you

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Answered by Anonymous
1

Find two numbers whose product is 20

and whose difference is 1

. The pair 5 , 4 works.

Hence

x2−x−20

=(x−5)(x+4) .

So solutions are

x=5 or x=−4

.Explanation:

(x−a)(x+b)

=x2−(a−b)x−ab

Matching this against

x2−x−20

we see that if we can find a and b

such that a−b=1 and ab=20

, then we can factor the quadratic into two linear terms.

The pair a=5 , b=4 works, giving usx2−x−20

=(x−5)(x+4)

This will be 0

when (x−5)=0 or (x+4)=0 , which is when

x=5 or x=−4.

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