torreswendy55591
27.07.2019 •
Mathematics
Which statement about the zeros of a quadratic polynomial is true? 1. there must be one complex zero, not just real zeros. 2. if the polynomial is quadratic, then it can have a maximum of 2 zeros, not 3. 3. if−4 and 3 are zeros, the conjugates 4 and−3 must also be zeros. 4. if the quadratic polynomial has 3 zeros, then it must have complex coefficients.
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Ответ:
If the polynomial is quadratic, then it can have a maximum of 2 zeros, not 3.
Since we are talking about quadratic expressions of the form
ax² +bx +c = 0 , with a,b,c ≠0
There are only two possible solutions
x1 = [-b + sqrt(b² -4a*c)]/(2*a)
x2 = [-b - sqrt(b² -4a*c)]/(2*a)
Ответ:
Step-by-step explanation:
Let the added metal is x.
The platinum content remains same on the input and output:
x*0.27 + 4*0.03 = (x + 4)*0.110.27x + 0.12 = 0.11x + 0.440.27x - 0.11x = 0.44 - 0.120.16x = 0.32x = 0.32/0.16x = 2