yadhirarodriguez yadhirarodriguez

19-11-2021
Mathematics

contestada

The product of 7 and the sum of a
number and 4 is 70. What is the number?

Respuesta :

Apinke123 Apinke123

19-11-2021

Answer:

x+ y = -7, or

y = -x-7 …(1)

xy = -60, or

y = -60/x …(2)

Equate (1) and (2)

-x-7 = -60/x, or

x+7 = 60/x, or

x^2+7x-60=0

(x+12)(x-5) = 0

x = -12 or +5 and y = +5 or -12, respectively.

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