An 18% discount on a watch saved a shopper $72. Find the price of the watch before the discount
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)
Answer: D) cube root of 16
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Explanation:
The rule we use is
In this case, x = 4, m = 2 and n = 3.
So,
Showing that the original expression turns into the cube root of 16.