The sum of nine and six-tenths and a number is thirteen and two-tenths. What is the number?
2 answers:
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First, note that Then use the formula for the sum of perfect cubes:
Therefore,
The quadratic trinomial couldn't be factored anymore, so the expression
has two factors
and
Answer: correct choice is A.
Answer:
x = ± 2
Step-by-step explanation:
given
40 - x² = 0 ( add x² to both sides )
40 = x² or
x² = 40 ( take the square root of both sides )
x = ± = ±
= ± 2