What is the value of x? Drawing not to scale
1 answer:
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We are given :
Step 1: factor the part inside square root
The function given inside square root is of quadratic form.
So let us try to factorise it using AC method.
Here A*C = 4*25 = 100
so we have to find factors of 100 that add up to give -20.
the two factors are -10 and -10.
Rewriting the function :
=
=
=
Step 2:
Now we take square root of the factorised form
=
Answer : (2x-5)
The company spends $649 on advertising
The sales function after advertising is given as:
When the total sales is $19,100, we have S(x) = 19100
So, the sales function becomes
Subtract 5 from both sides
Divide both sides by 7
Take exponents of both sides
Subtract 1 from both sides
Hence, the company spends $649 on advertising
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