Answer:
Option B. 4
Step-by-step explanation:
The given expression is x² + 4x + -----
We have to find a number which can be added in the expression to make it a perfect square trinomial.
x² + 2(2x) + 2²
= (x + 2)²
Therefore, if we add 4 in the given expression it becomes a perfect trinomial.
Option B is the correct option.
Answer:
D. X + 9
Step-by-step explanation:
x² + 2x - 63
What 2 numbers multiply to -63 and add to 2
9 * -7 = -63
9+-7 = 2
(x+9)(x-7)
Answer: 51
Step-by-step explanation:
let x be the number.
(70%)x = 42
0.7 x = 42
x = 60
we check 15% x 60 = 0.15 x 60 = 9, which is true.
85% of that number = 85% x 60 = 0.85 x 60 = 51.
I am pretty sure it is A- The energy of a photon is h x c.
Step-by-step explanation:
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