Two numbers have a difference of 15 and a product of 199.75.The l_英语解答

Two numbers have a difference of 15 and a product of 199.75.
The larger of the two numbers is x.
(a) Show that
x2 – 15x – 199.75 = 0
(3)
(b) Solve the equation
x2 – 15x – 199.75 = 0
X2是 X的2次方

人气：453 ℃　时间：2020-04-01 07:53:44

解答

Since X is larger,X-15 is the smaller No.Therefore,199.75=x*(x-15)
a)LHS=x2-15x-x·(x-15)
=0
=RHS
b)x=-8.5 or23.5