Slope is - 4 and the line passes through the point (1,3 )

Mathematics

1 answer:

Sergeeva-Olga [200]2 years ago

3 0

Y = -4x + 7
This is the equation of the line. The slope is -4. The Y- intercept is 7

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What is the zero in the quadratic function f(x)= 9x^2-54x-19?

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The quadratic formula is

$x=\frac{-b+\sqrt{b^2-4ac} }{2a}$ .

It is important because while some quadratics are factorable and can be solved not all are. The formula will solve all quadratic equations and can also give both real and imaginary solutions. Using the formula will require less work than finding the factors if factorable. We will substitute a=9, b=-54 and c=-19.

$x=\frac{-b+/-\sqrt{b^2-4ac} }{2a}\\x=\frac{-(-54)+/-\sqrt{(-54)^2-4(9)(-19)} }{2(9)}\\x=\frac{54+/-\sqrt{2916+684} }{18}$