heroic56
20.04.2020 •
Mathematics
At first, Bala had $90 and Charlie had $48. Each bought a pants at the same price. The amount of money Bala and Charlie had left were in the ratio 4 : 1. How much did the pants cost?
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Ответ:
2x^2+16x=-18
dividing through by 2 we get:
x^2+8x=-9
but
c=(-b/2a)^2
c=(-8/2)=16
hence
x^2+8x+16=-9+16
x^2+8x+16=7
(x+4)(x+4)=7
(x+4)^2=7
thus getting the square root of both sides
x+4=+/-√7
x=-4+/-√7
x=